What it is
A mentor is a character who is ahead of the protagonist in the one area this story is going to test, and who is willing, often reluctantly, to hand some of that lead across. The definition has three parts, and all three have to be there. Ahead of the lead. Ahead in the specific thing this book puts on trial. Prepared to share some of it.
Notice what the definition leaves out. Age, robes, a beard, and wisdom are all optional. A mentor is a relationship, and a relationship can wear any costume. Picture a crab boat, made up for the purpose. One deckhand is twenty-four with two seasons behind him. The new hand is nineteen and on his first. The twenty-four-year-old is the mentor, and his age has nothing to do with it. Or picture a hospital ward at three in the morning, where a junior nurse teaches a senior doctor how the ward really works at that hour. On that single subject the nurse is the mentor. Everywhere else in the building, the doctor outranks her.
So "mentor" names a job inside one story. Treat the mentor here as a working character: what gets handed over, how the mentor is taken off the board, and how to stop a helpful teacher from flattening your lead. The shared vocabulary for jobs like this one, where the pattern comes from, and why most accounts credit the wrong people, all live on the Archetype page.
The job has two halves. The first half is to supply what the lead cannot generate alone, whether a skill, an object, or grounds for self-belief, and then to get out of the way, so that the final hard task is the lead's alone. Supplying is easy to write. Removal is where drafts fail, because a competent, reachable helper will keep solving things for as long as you let them. The second half is to make the teacher a person, with an errand of their own, partly selfish reasons for teaching, and the occasional mistake. A mistaken mentor generates story. A wise one only dispenses information. Three decisions, then: the good supplied, the exit, and the mentor's private want. Skip them and you have written a helpline with a name.
A mentor can hand over exactly three kinds of thing. There is no fourth.
- Knowledge. A method, a craft, the rules, a secret, the name of whoever did it. Whatever the lead lacks and cannot learn fast enough on her own.
- A tool. Something physical that changes hands and widens what the lead can attempt: three thousand dollars, an alibi, a key, a password, a sword, a letter of introduction.
- Belief. Permission, or the mentor's conviction that the lead is no impostor. You cannot hold it in your hand, and it is often the strongest of the three, because readers feel it more dependably than the other two.
Choose one. The other two may show up, but they stay incidental. To pick, look at the lead on page one and find the shortfall. Short of skill: knowledge. Short of access or power: a tool. Short of nerve, meaning she could do it but will not try: belief. One warning here. A lead whose problem is nerve should not also get a training montage, because teaching a skill she already has improves nothing. Get the match wrong and the reader senses a wrongness she cannot name. Say the need was permission, and a magic sword arrives instead. The villain dies by the sword, and the ending rings hollow, because the sword was never the doubt.
Now the part drafts get wrong. The mentor has to go, and there is no workaround, because the reader has to believe the lead won. Keep a capable, willing ally on stage at the climax and the reader's question flips from can she do it to why isn't he doing it. Every scene of the ending then spends energy justifying the mentor's uselessness, and that energy comes out of what matters. Agency is the general form of this problem, and the Protagonist page explains why the lead's own choices have to produce the ending.
"Go" means unavailable at the test. Dead is one way to be unavailable, and only one. Five ordinary exits exist, and each leaves a different mark on the book.
Death ends the relationship and turns the teaching into an inheritance. Writers use it more than any other exit by a wide margin, and overuse is its chief weakness.
Betrayal turns the mentor into opposition. In an overpopulated cast this is the most efficient exit, since one figure now does two jobs. It costs warmth, though, because every earlier lesson gets reread as manipulation.
Absence removes the mentor physically, with no death: a transfer, an arrest, a voyage, a hospital stay, a war somewhere else. Absence is the most reusable exit in series fiction, because the mentor can come back in book four.
Refusal means the mentor stops helping, on principle or out of fear. Underused and very strong. The lead has to be right without support, and the refusal leaves an argument the ending has to settle.
Being wrong moves nobody at all. The mentor is present, willing, and mistaken, the advice is unusable, and the lead has to disobey and then be proven right. One of fiction's most satisfying reversals.
A sixth option, present but unable, is really a variant of the others. The mentor is in the room and the setup bars him: the coach outside the ring, the handler outside the field. Of all the exits, this is the easiest way to keep the warmth and still isolate the lead for the test.
Then there is the mentor's own goal. A mentor who only hands out advice is a delivery mechanism. A character wants something. The symptoms of the delivery mechanism are easy to spot. Every appearance is triggered by the lead's need. He has no plans that get in the plot's way. He wants nothing for himself. Readers treat him as furniture, and the way they put it is that they forgot he was there.
The fix is one sentence. More backstory will not do it. Ask: what is this person trying to get, independently of the protagonist? Money. Redemption. A grandchild's respect. Reinstatement in the post they were fired from. Being proved right about something that happened in 1971. Then set that goal so teaching costs something. The best mentor scenes have a teacher who wants two things at once, and helping is only one of them. K.M. Weiland's article on Helping Writers Become Authors, listed below, makes the same case: a mentor should make the lead's problem harder rather than solve it, and the teaching should carry a cost. David Corbett's The Art of Character, also listed below, is strong on building a character out of contradictory desires, and that construction is what divides a teacher with a life from a talking instruction manual.
The quickest way to a mentor with a life is to make him fallible. Right about the main thing and wrong about something else, or fully right and unable to practice what he preaches. Start there. A fallible mentor keeps the story moving: the lead gets a reason to doubt, doubt produces decisions, and decisions make character. And once the mentor has been wrong once, his rightness everywhere else starts to count, because the reader can no longer assume it.
Push fallibility all the way and you reach the anti-mentor, who teaches what the lead will eventually have to unlearn. The anti-mentor is coherent, authoritative, wrong, and usually close to true. Instead of removing the lie the lead believes, this teacher installs it, and the lead's character arc becomes an escape from a teacher she loves. No other version of the role does more inner work, and writers use it far less than they should.
Two neighboring roles get confused with the mentor. A foil shows a trait by contrast and never has to teach anything. A love interest may teach, but a relationship whose engine is instruction fails as a romance. The wider rule, that every named character needs a goal, lives on the Supporting Cast page, and the Relationship Web page shows how to map these connections across a whole cast.
Why it matters
The mentor is where agency leaks out of a draft. Agency is the lead's power to push the story, and the mentor is the commonest place a draft loses it. For a working writer, that is the reason to take this element seriously instead of filling a slot with it. The mechanism is simple. The lead needs to know something, so you write a mentor. A character who explains things is handy. Handiness accumulates. By chapter twelve the tally reads: magic explained, villain named, plan supplied, trap warned of, train ticket bought. No single scene looks wrong. Add them up and you have a passenger for a protagonist, and the beta notes come back saying the middle drags and the lead is passive. The Exposition page explains why information the reader is not ready for gravitates to whichever character knows things, and the Backstory page covers the mentor used to speak the past aloud.
A mentor's death has to be worth something. Mentor deaths cluster at the book's lowest point, the All Is Lost beat, and a death there has emotional work to do. It can only do that work if there is a relationship to lose. Suppose the mentor arrives in chapter three, serves as an information source for six chapters, and is killed in chapter twenty-two. The reader shrugs. A more dramatic death cannot fix that. The fix is more ordinary relationship earlier: scenes of irritation, a petty moment from the mentor, the lead noticing something private and not being told what it is. Oren Ashkenazi's piece on Mythcreants, listed below, takes on the timing directly, meaning how late a mentor's death has to fall before it registers, and what you can do instead of killing them. Sacha Black's 8 Steps to Side Characters, also listed below, has a section on character deaths that earn something.
In a series, the mentor is an asset and a liability at once. Most of this site's readers work in series, and a mentor is a returnable character. Readers attach fast, the history is already built, and the mentor carries a subplot at almost no cost in setup, because the goal is already set. The risk shows up over ten books. Left unmanaged, a surviving mentor turns every climax into a debate about the phone call the lead did not make. The professional fix is structural: elsewhere, injured, out of favor, wrong, or bound by a rule. Apply it early. Every book you wait makes it dearer.
Each genre promises its readers a particular mentor. Epic fantasy expects a teacher and forgives a stock one. The readers of a police procedural want a senior officer who is fluent in the system and in right versus wrong. Romance expects a confidante rather than a trainer, and resents a love interest who lectures. Work out which good, knowledge, tool, or belief, the genre's readers arrived wanting, and that choice determines the mentor. The Reader Promise page covers the rest of that bargain.
Real-world examples
The Karate Kid (1984): belief handed over through chores and a letter
The Karate Kid came out on June 22, 1984, directed by John G. Avildsen from a screenplay by Robert Mark Kamen, with Ralph Macchio as Daniel LaRusso and Pat Morita as Mr. Miyagi. Morita was nominated for the Academy Award for Best Supporting Actor. No film in popular culture teaches the mentor more cleanly, and nearly everything people remember about it is a craft decision.
Start with how the knowledge arrives. Miyagi gives Daniel chores: sanding, waxing, painting. The film withholds what the chores mean until one scene reveals them as training. No lecture, no exposition. The audience learns at the same instant as the student. Steal that trick whenever you need to get a method into a story without a speech.
The real good, though, is belief. Daniel's problem was never that he cannot fight. He has been beaten and humiliated, and he has decided he is the kind of person who gets beaten. The film's answer is a person who holds a different estimate of him.
Miyagi has a life of his own. He is a handyman. He grows bonsai. Once a year, on his wedding anniversary, he gets drunk. The best-remembered scene in the film is that one: Miyagi drunk, and Daniel reading a letter from the war. Miyagi's wife and newborn son died in the Manzanar internment camp in 1944 while he was serving in Europe with the 442nd Infantry Regiment. For one scene the teacher becomes the one being cared for. The tournament plot does not need the scene at all, and that is the point. Kamen has said in interviews that Columbia wanted it cut because it slowed the story down. He fought to keep it, and he called it "the heart of the movie". If one scene earned Morita his nomination, this is the scene.
And the exit? No death, no departure, no turn. Miyagi simply cannot enter the ring. He stands fifteen feet away, unable to help, and the last fight is Daniel's own. The warmth is kept and the lead is isolated anyway.
Five novels from 1897 to 2009: one exit each
Each of the five ordinary exits has a well-known novel that shows it, and each turns on a late event. Read everything under this heading as spoilers for books published from 1897 to 2009.
Death, placed late. Gandalf falls in the Mines of Moria in The Fellowship of the Ring (published July 29, 1954), and the fall comes deep into the volume, after hundreds of pages in his company. He returns in The Two Towers (November 11, 1954). But when the real test comes at Mount Doom, he is nowhere near it. Tolkien's setup is the one to copy: the mentor may return, provided he is absent at the deciding moment.
Death as inheritance. Dumbledore dies at the end of Harry Potter and the Half-Blood Prince (2005), and all of Deathly Hallows (2007) runs on the instructions he left, which turn out to be incomplete. Here is the best form of mentor death: a job handed over with pieces of the manual missing, rather than a helper subtracted.
Refusal. In Ursula K. Le Guin's A Wizard of Earthsea (1968), Ogion denies Ged what he wants. He teaches slowly and holds back the spectacular, and in the end he releases Ged to a school that will indulge him. Nobody is killed. The refusal is the lesson, and Ged grasps it only after it has cost him badly.
Betrayal, or close to it. In Suzanne Collins's The Hunger Games (2008), Haymitch Abernathy supplies Katniss with one specific piece of knowledge: how to make sponsors like her. The next sentence spoils Catching Fire (2009). At its end, Katniss learns that Haymitch was working to a plan she was deliberately kept out of. Every piece of his advice gets recolored. His loyalty was real, but it was never chiefly to her.
Being wrong. Van Helsing in Bram Stoker's Dracula (1897) looks like a professor driving an exposition machine, the expert who explains vampires to the other men. Look instead at what he achieves. He knows Lucy Westenra's condition the moment he arrives. He withholds its name from the other men. He exhausts his remedies, and Lucy dies anyway. That expert failure opens the second half of the book, in which ordinary people with no guarantee are forced to act.
Across all five, the exit does more than clear the stage. It changes what the teaching meant. The exit is a decision about theme, so make it on purpose.
Ender's Game (1985): the mentor whose goal outranks the student
Orson Scott Card's Ender's Game began as a novelette in Analog Science Fiction and Fact in August 1977. Tor Books published the novel in January 1985, and it won the Nebula Award for 1985 and the Hugo for 1986. No book makes a stronger case for a mentor whose goal outranks the student's welfare.
Colonel Hyrum Graff recruits Ender and then runs a program of isolation. He stirs up hostility against the boy, alters the rules, and uses promotion as a tool for breaking him. His aim is a commander, ready before the war is lost. A happy child was never on the list. Every kindness is a tool, and every piece of training is real. Graff is no villain. He has an aim he can defend and acts he knows he cannot, and he admits it. That makes him instructive rather than simply cruel.
Later a second teacher takes over Ender's training and withholds one fact, the one fact that would change how Ender behaves. The next sentence spoils the ending. Ender believes he is running simulations, and learns afterward that he commanded real fleets and destroyed a species.
The craft point: the twist is a function of the mentor relationship. The mechanism is a trusted teacher with private reasons, rationing what the pupil may know. If you write a withholding mentor, the secrecy has to come from the mentor's own goal. It can never come from the author wanting a surprise.
The Prime of Miss Jean Brodie (1961): the anti-mentor in its purest form
Muriel Spark's The Prime of Miss Jean Brodie first appeared in The New Yorker in October 1961, and Macmillan published the book edition in 1961. The novel is short and still widely in print, and it shows the anti-mentor in its purest form.
Jean Brodie teaches at a girls' school in Edinburgh. She picks favorites, the Brodie set, and her own curriculum beats the official one: art, Italy, romance, and the conviction that they are exceptional. She admires Mussolini and Franco. She steers one pupil, Joyce Emily, toward the Spanish Civil War, on the Nationalist side, and the girl dies there.
Brodie ticks every mentor box. She supplies belief. She supplies knowledge nobody else in the novel can offer. She is memorable, quotable, and devoted. Her teaching poisons for one reason: love delivers it, and parts of it are true. The next sentence spoils the ending. Sandy, one of the set, goes to the headmistress with the means to force Brodie out, and Brodie spends her remaining years on a single question, which of the girls turned her in.
The lesson is that a mentor's influence can be a book's antagonist without one villainous act. Sandy's arc is harder than escaping an abuser. She has to sort the true parts of the teaching from the rest, then destroy the person who gave it to her. If you want four hundred pages of inner conflict, give your lead good teaching that leads to wrong conclusions.
Whiplash (2014): the mentor who is also the antagonist
Damien Chazelle wrote and directed Whiplash (2014). Andrew Neiman, a nineteen-year-old jazz drummer, meets Terence Fletcher, a conductor at a conservatory, and the film makes Fletcher mentor and antagonist at once. J. K. Simmons won the Academy Award for Best Supporting Actor for the role. By Chazelle's own account, Fletcher grew out of a cutthroat high-school jazz band that Chazelle played in.
The film's engine is that Fletcher is not obviously wrong. He makes Andrew better. He spots real talent. The abuse, a thrown chair, slapping, humiliation in front of the band, is shown right beside the results, and the debate over the film is still open.
Here is the detail to steal. Fletcher justifies himself with an anecdote. In his version, Jo Jones hurled a cymbal at Charlie Parker's head after a poor solo, and that humiliation made Bird. The real event happened in 1936, at a jam session at the Reno Club in Kansas City. By the bassist Gene Ramey's later telling, Jones let a cymbal fall, or flung it, onto the floor by Parker's feet, the jam-session signal to get off the stand. Fletcher's head-aimed, cruelty-makes-genius version is a retelling. Forrest Wickman, writing in Slate in October 2014, argued that the distortion is load-bearing: the film's whole philosophy depends on it.
The technique: a mentor's authority usually stands on a story about how the world works. Put a visible crack in that story and readers judge the mentor for themselves, with no instruction from the narrative. A mentor's maxims do not have to be true. They have to be plausible for that character.
Beyond quest fantasy: five genres that use the mentor without a sword
The mentor is not a fantasy-only device. Most working writers will meet one in a genre with no swords in it. Here are five.
The senior detective. Endeavour ran on ITV for nine series, from 2012 to 2023, devised by Russell Lewis from Colin Dexter's characters. Detective Inspector Fred Thursday takes the young Morse on as his bagman and teaches him how to be a policeman, which is a different thing from how to be clever. Thursday has a life: a wife, two grown children, war service in North Africa and Italy, and blunt methods the brighter junior man reads as crude. The removal comes without a death. Series six opens with the old station shut and the team scattered. Thursday has been demoted and posted to another station, and Morse is in uniform in a village. Each has to work without the other. Transfer is an exit crime fiction uses constantly and fantasy almost never.
The coach. Ted Lasso first aired on Apple TV+ in August 2020, created by Jason Sudeikis with Bill Lawrence, Brendan Hunt, and Joe Kelly. Belief is the only good Lasso supplies. The premise is a joke: a coach from American college football hired by an English football club, knowing nothing about the game. What he gives is attention and conviction. Then the show makes a braver move than most stories manage. Nate, the equipment manager raised to assistant coach because Lasso believed in him, sours when the attention stops and turns on Lasso at the end of season two. Mentorship is shown as a duty running both ways, and the teacher can fail it.
The editor. In stories about publishing, the mentor is often an editor, and real editors illustrate the role better than fictional ones. Maxwell Perkins, whose dealings with his authors ranged from essential to overbearing, gets his full treatment on the Editing page. The lesson carries over: the editor-mentor's good is judgment, and judgment is the hardest good of all to hand across, because eventually the pupil has to reject it.
The older sibling. In S. E. Hinton's The Outsiders (1967), every mentor is a teenager: an older brother holding a household together, and a friend whose final note is the narrator's only instruction.
The confidante. In romance, the usual mentor shape is the confidante rather than the trainer. Mrs. Gardiner in Jane Austen's Pride and Prejudice (1813) is Elizabeth's confidante. She tells Elizabeth the practical, unwelcome, useful truth about money and about Wickham. No training, no tool, no belief. Just the one conversation Elizabeth could not have had with anyone her own age.
An everyday scenario: the mentor who kept answering the phone
Here is a made-up case. A writer has eighty-five thousand words of a contemporary thriller on the page. The climax is written and it does nothing. She has rewritten the last three chapters twice.
The cause is Oswin. He is the mentor of the protagonist, Bryn: a retired fraud investigator, sixty-eight, the man who taught her to read shell-company filings. Readers like him. He is also alive, in the same city, with a cellphone he answers.
In chapter thirty-one Bryn cannot read a document, so she calls, and Oswin explains it. In chapter thirty-four she needs access to a building, so she calls, and Oswin has a contact. In chapter thirty-eight, the night of the climax, she calls again. He tells her to go to the police, and the scene strains to explain why she does not. Each call was easy to write. Together they turn the climax into a conversation with a competent adult, and the tension leaks out through the phone.
Polish cannot fix this. The phone has to go, and there are five choices, each of which changes the book. Kill him, and the last act becomes grief plus improvisation. Have him refuse: he investigated this once, he will not touch it again, and the last act gains an argument. Put him out of reach: a stroke, a vacation, an arrest, witness protection. Turn him: the man who taught her to read the filings is the one who wrote them. Or leave him fully available and wrong. He says go to the police, and she has to disobey a man who has never been wrong, and be right.
The fifth option costs the fewest pages and pays the most. No funeral, no journey, no new cast member. What it needs is a decision, made before the climax, that Oswin's judgment stops somewhere, and then one added scene, back in chapter nine, that shows where it stops.
Try it yourself
This takes about thirty minutes. Use it on a book you are planning or one you are stuck in.
- Name the deficit. Finish this sentence in one line: at the start of this book, the protagonist cannot succeed because she lacks ______. Be specific. "Confidence" and "training" are different answers, and they point to two different mentors.
- Pick one good. Knowledge, tool, or belief. Write down the one your mentor supplies and cross out the other two. If you cannot choose, the lead's lack is not yet clear to you, and that is the thing to fix first.
- Write the mentor's errand. One sentence, with no mention of the lead: this person wants ______, because ______. If you cannot fill it in, you have a delivery mechanism. Keep working until the sentence would still hold if the lead had never appeared.
- Make the teaching cost something. Find what the errand loses every time the mentor helps: time, money, safety, a secret, a reputation. Show that cost at least twice, in ordinary scenes, and place it before the plot needs it.
- Choose the exit and date it. Six candidates: death, betrayal, absence, refusal, being wrong, present but barred. Write down your choice and attach a chapter number. If death was your first instinct, write a sentence apiece on the other five and check whether one of them beats it for interest.
- Audit every mentor scene for a want. For each appearance, write the mentor's goal in that scene. If more than one scene has the honest answer "to tell the protagonist something", you have exposition in a character's clothes. The cure is a reason for the mentor to keep quiet, or a new home for the information: a document, a rumor, an enemy.
- Count the last quarter. From the three-quarter mark, tally the problems solved by the lead and the problems solved by the mentor. The mentor's number should be zero, or nearly. If it is higher, you have found why the ending feels flat.
- Test the death, if there is one. List three things that can now never be said between the lead and the mentor. Add one habit or object that resurfaces after the death. If three things will not come, no relationship was built and the death is only a plot device. The repair happens earlier in the book, never at the graveside.
- Write the advice the lead gets wrong. Give the mentor a piece of advice that is sound in general and disastrous here. The lead follows it once and pays. One move turns wise into fallible, and the return on it usually comes within a chapter. Then fill in this card and keep it with the manuscript:
Deficit: __________ Good supplied (one only): knowledge / tool / belief Mentor's own goal: __________, because __________ What helping costs them: __________ Exit: __________ at chapter __ Problems solved by mentor after the 75% mark: __ Advice that is right in general and wrong here: __________
Common mistakes and misunderstandings
Hiding exposition inside the mentor. The commonest failure has nothing to do with a bad mentor. The mentor is a convenient hiding place. A character who knows things is where writers dump whatever the reader has not been told yet. Test every mentor scene with one question: does the mentor want anything in it apart from helping the reader understand? If the answer is no, you have written a lecture with a name on it, and readers skim it. The Exposition and Backstory pages give that information better homes.
Letting the mentor solve the problem. Rarely deliberate. It accumulates one favor at a time until the lead no longer drives the book. Diagnose it with the tally from step 7, because the final quarter is the zone of damage.
Treating a death as automatically a loss. Killing a mentor the reader barely knows buys nothing. The death that pays for a whole third act has three features: a funeral the lead cannot get to, a voice that comes back at inconvenient moments, and a final exchange that was a squabble over something trivial. All of that is built before the death. None of it can be built during it.
Wisdom as a personality. The mentor who is always right, always calm, and always available is a reference book. Fix him by making him correct on one subject and unreliable on the rest: vanity, no money, fear, a grudge against a coworker. Then the teaching scenes and the lead's doubts both start producing story.
Age as the qualification. The real qualification is a lead in the one area under test. A mentor can be younger than the lead, poorer, less educated, and less admirable, and still work.
Two mentors who agree. Two agreeing mentors are one mentor. Give the two teachers advice that cannot both be followed and force the lead to choose, or merge them. Merging is also the usual cure for an oversized supporting cast.
Letting the mentor state the theme. Tempting, because mentors are licensed to be wise, and the fastest way to flatten a book. Theme works through choice and consequence. A moral announced by the mentor tells the reader the argument is closed. If the mentor has to address the theme at all, make him a little off about it.
Assuming the archetype fixes the arc. Nothing in the role requires the mentor to die, to be old, to be male, to be mystical, or to approve of the lead. Those are habits built by repetition, and the Archetype page unpacks them. The twist where the mentor was secretly the villain has become as stale as the pattern it reverses, and readers see it coming.
The reachable mentor. In a contemporary setting, a capable mentor plus a working phone equals dead tension. Settle the unavailability early, and root it in who the mentor is, never in plot accident. Otherwise every crisis scene has to carry an excuse.
A static relationship. If the relationship is the same in chapter thirty as it was in chapter four, you have missed a subplot. The normal drift is for the pupil to draw level and then overtake: correcting the teacher, then nursing the teacher, then out-arguing the teacher. The mentor gets a character arc too, and one of the most dependable emotional engines in fiction is a mentor growing old and losing the very capacity that made them worth having.
Related elements
- Archetype: where the mentor pattern comes from, what is actually known about it, and who gets wrongly credited.
- Hero's Journey: the structure that named "meeting the mentor" as a beat, and the arguments around it.
- Protagonist: why the lead has to win the final fight alone, which is the whole reason the mentor exits.
- Agency: what a helpful mentor drains from the lead, and how to measure the loss.
- Supporting Cast: the general rule that every named character needs a goal of their own.
- Foil: the neighboring role, which works by contrast and never has to teach.
- Relationship Web: mapping the mentor against the rest of the cast so no two connections do the same job.
- Love Interest: the role writers mix up with this one most often, and why the mix-up undoes the romance.
- Exposition: the failure mentors invite, and better homes for the information.
- Backstory: how much of the mentor's history to show, and when it earns its place.
- Character Arc: the mentor's own arc, which most drafts forget.
- The Lie: what the anti-mentor plants, and what the lead has to unlearn.
- All Is Lost: the usual landing spot for a mentor's death, and what that death has to be worth.
- Series: keeping a mentor alive across many books without letting them resolve every climax.