Arc Types

Five arc shapes run on one skeleton — a Lie, a Truth, a Want, a Need, a Ghost, and a Normal World — and the type is fixed by a single decision: what the character does at the crux where holding the Lie and holding the Truth become mutually exclusive. Positive, flat, and the three negatives are the same machine with the last lever thrown differently. This is what lets a whole cast run different arcs while no one dies: everyone lives, and no two are the same in the end.

The shared skeleton

Six ingredients sit under every arc (Weiland’s vocabulary; Truby and McKee supply the psychology and the value mechanics):

• The Lie — the false belief about self or world that governs the character at page one. It shows as behavior, never as a stated creed. 阮草’s Lie is love is provision; carry everyone alone, take no hand — dramatized by her refusing every hand and taking secret shifts after the six-month work rule. 沈文’s Lie is provision isn’t love; only presence — someone who stays — counts — the “I did it for you” he was raised on reads as counterfeit, dramatized when 阮草’s cooking goes cold on the table while she works and he reads the empty chair as withdrawal.
• The Ghost (the Wound) — the backstory injury that installed the Lie. 阮草’s is the Hanoi shop wiped out by a scam plus being The One Who Made It; 沈文’s is a provided-for, unseen childhood plus a grandmother slipping into dementia. Render the Ghost as a concrete object introduced early and explained late: 沈文’s B1L02 photo is the Ghost worn as an object, and it is not explained until the grandmother meeting (B3L10) and the heritage reveal (B4L11).
• The Want — the external, nameable goal the Lie produces. 阮草 wants to pay the family out (the monthly envelope home). 沈文 wants to find his grandmother and write her paper letters. Both are objects a beginner-tier vocabulary can name.
• The Need — the internal truth that would make the character whole, and which the Want is standing in for. 阮草 needs to let herself be carried; 沈文 needs presence-love and a chosen family. In a positive arc the Need arrives late and usually costs the Want.
• The Truth — the accurate worldview the story argues for. Change-arc characters move toward it, flat-arc characters start on it, negative-arc characters lose or refuse it.
• The Normal World — the opening state steeped in the Lie.

The crux sets the type

One choice at the crux — where holding the Lie and holding the Truth become mutually exclusive — decides the type.

Arc	The choice at the crux	End state	Cast grounding
Positive change	Rejects the Lie, takes the Truth, usually loses the Want	Whole, changed	阮草 lets herself be carried; 白龍 lets people in
Flat	Already holds the Truth; turns it on the world	World and cast changed, self steady	沈文’s presence-Truth draws 白龍 into the family
Disillusionment	Reaches the Truth; the Truth is bleak	Awake, sobered, still standing	星野 turns to face the OL life she dreaded
Fall	Refuses the Truth, is destroyed by the Lie	Worse, undone	no canon fall (see below)
Corruption	Starts on the Truth, abandons it for the Lie	Morally worse	the B4 weaponized confidence (partial)

Corruption is the positive change arc run backward. Fall is the Aristotelian tragedy: the character never escapes the Lie and it ruins them. Disillusionment is the lightest negative and the only one that ends with the character consciously holding the Truth — awake in a dark place, standing at a crossroads that could still turn life-affirming. Yorke’s unifying claim earns its keep here: comedy and tragedy are one five-act shape, and tragedy is the character learning the wrong lesson at the crisis or failing to act on the right one. Design a paired positive and negative arc on one skeleton by writing the crux twice.

Positive change

The character begins in the Lie, is progressively cornered by a Truth, and at the climax throws the Lie over and is transformed, gaining the Need at the cost of the Want. 阮草 runs the cleanest instance: her Want (the envelope, the shifts) dramatizes her Lie in action across B1–B3; her cracked and burned hands accumulate as the visible cost; the reconciliation with 沈文 is where she lets herself be carried for the first time — she takes the Need and the fortress-Want of carry it alone falls. The resolution stays “changed, not restored”: she lands a better job (B4L10), the burden eases, her first day off in a year arrives. Small wins are big. The arc closes without the crisis fully resolving, and it earns that because the reader watched the cost.

白龍 runs the same shape on belonging: isolation as the Lie (I make peace with being alone), the group as the Truth he is drawn toward, 沈文 reaching out at B1L13 as the first crack, hosting the typhoon party (B3L03) as the character acting from the Truth he once refused.

Flat

The character already holds the Truth at page one and does not fundamentally change; the change happens in the world and in the supporting cast, each of whom the character’s steady Truth converts away from their own Lie. 沈文’s presence-love is a Truth he mostly holds early — show up, stay, be the one who has what you need — and the flat-arc mechanic is visible in what it does to others: he sits down with lonely 白龍 (B1L13) and draws him toward the group, gathers the lonely, lets 阮草 adopt him. 白龍’s isolation-to-belonging arc is the supporting change that 沈文’s steadiness converts.

This mechanic is free serial architecture. A single steadfast Truth-holder converting a cast gives every side character a natural B-plot that reaches its own turn on a different book, which is why flat-arc stories read as ensemble and world-change stories. Match the vocabulary ramp to arc payoff by handing each converted character their crisis when the language to hold it exists.

Disillusionment

The character overcomes a Lie and reaches a Truth, and the Truth is bleak; they end awake in a dark or sobered space, aware of and accepting the thematic Truth. 星野遙香 runs it exactly. Her Want is escape — cram a lifetime of freedom into Taiwan, dodge the summons home with visa hacks and another year of school. The Lie is the assigned life can be outrun. The dread seeds under the genki early (B2L14), keigo surfaces as her center-stage article at B3L04, and at B3L09 the mask cracks — the group-of-6 scatter breaks the Taiwan-family she hoards proof of, detonating the karoshi dread — and she turns to face the OL future rather than run. She goes home her own way (B5L04): the Truth she reaches — the path was always going to claim her — is bleak, and she stands in it clear-eyed, authoring how she lives it. The end is sobered and mature, and she consciously holds the Truth. That conscious hold is what separates disillusionment from the two heavier negatives.

Fall

The character fails to overcome a Lie and ends worse than they began, undone by resisting the light of a hard Truth; the tragedy is that they could have changed and refused. Weiland’s “could have changed and refused” is the whole load-bearing element — it is what makes a fall tragic instead of merely sad, and it requires the Truth to be offered repeatedly and turned down in view of the reader.

No character in canon completes a fall. 阿迪 supplies the descent and the off-ramp without the ending: the Truth he keeps refusing is own the responsibility, answer the call home (his father’s tired eyes in the L02 photos are the standing offer), and his fracture is real — a family emergency plus overwork sink him, he sits the exam, fails, is held back a level, and the class splits (B3L08). Canon takes the off-ramp: he answers home for real, fuses dream and legacy, and recovers by B4L07. A beat that would turn this into a true fall, marked as a suggestion and not canon: give 阿迪 the same fracture, stage the call home three times, and have him refuse each time until the workshop and the design both collapse — the same descent with the recovery door written shut.

Corruption

The character starts out holding a Truth and progressively abandons it for a Lie, driven by fear, pride, or desire, ending morally worse; it is the mirror image of the positive change arc. The B4 betrayal beat is a partial, real instance: under the strain of every arc peaking and the goodbye looming, one of the campfire confidences gets weaponized or leaked, the betrayed is gutted, and the group splits over the betrayer. The betrayer abandons the group’s trust-Truth for a Lie under pressure — a corruption move, both sides written real, the hardest repair the B5 reunion must survive.

A full sustained corruption arc does not exist in canon; the betrayal is a single beat, and its character is unnamed. A device that would seed one, marked as a suggestion and not canon: plant a concrete “small compromise” scene at B1 — a character taking something small that is not theirs, shown flat and un-judged — that only re-reads as the first domino once the later betrayal lands. The small-compromise seed pays the show-don’t-tell debt: at B1’s action-only vocabulary the corruption cannot be stated, so the object and the act must carry it until the abstract-emotion vocabulary of B4–B5 can explain it.

The abyss prices the crux

The low point makes the crux cost something. Pity and fear build to a recognition and a reversal that discharge as catharsis, and Aristotle’s strongest-plot rule holds: peripeteia and anagnorisis landing at one stroke cut deepest. The 沈文↔阮草 rift is the worked case — his fear of losing the family he built comes true, the group fractures along its own founders, and the discharge is the moment 沈文 sees 阮草’s cracked and burned hands: recognition (he had read her cold withdrawal as rejection; the hands reveal she was drowning) and reversal (his hurt flips to understanding) at one stroke, resolved through wordless food rather than a speech.

The power rides on internal stakes — identity, love, belief — never mortal peril. Catharsis without death is the standing rule: the “whiff of death” is the loss of a relationship, a place, or the long-planted Ghost object (阮草’s hands, the empty chair, the café closing), and anagnorisis is dramatized as one character finally naming aloud a Truth planted books earlier. The full treatment lives in The Low Point and Catharsis; the point for arc typing is that the abyss earns whichever choice the crux demands.

Typing arcs under a vocabulary ceiling

The distinctive constraint: the vocabulary curve is the reveal curve, and it forces how types get distributed. Depth arrives exactly as fast as the reader earns the language to hold it (B1 ~250 Han / A1 through B5 ~1000 / C1), so arc type gets rationed across the cast rather than loaded into one book.

• Anchor the early books on the flat-arc, Truth-already-held character. A steadfast character reads as consistent through repeated concrete action, which A1/B1’s action-only vocabulary can depict with plain verbs and no interiority words. 沈文’s readiness across B1 does this.
• Put the negative arcs on secondary characters whose decline shows externally — choices, who they sit with, what they stop doing — so the payoff can wait for B4–B5 when abstract-emotion vocabulary exists.
• Split Want from Need across the ramp. The Want is a nameable object at B1–B2 (the envelope, a letter, a seat); keep the Need unnamed until B4–B5. The Moment of Truth becomes the literal first scene the character can say the Need aloud — 沈文’s 圍爐 line at B2L15 (“I didn’t really have this growing up”) is the plant getting words, converging at B3L07 when he names the group as the family he never had.
• Front-load the cores to end of B3. Most students leave around B3, so the change-arc climaxes land there while the language to hold interiority (B1-tier/B3) has just unlocked; B4–B5 carry the capstones for finishers.

Percentages elsewhere in the craft (First Plot Point ~25%, Moment of Truth ~50%, low point ~75%) are Weiland/Field/Snyder scaffolding conventions, model-dependent, not laws. Snyder himself hits All Is Lost slightly before 75%.

Boundaries

Weiland’s flat arc describes a fully dimensional character who holds the Truth and changes the world. Forster’s flat character describes a figure built round a single idea with no interiority and no capacity to change (his round character can “surprise convincingly”). These are different axes — capacity-to-change versus steadfast-Truth — and the single most common error in secondary arc writing is fusing them. A flat arc still demands a rich interior and real external opposition; 沈文 is a round character running a flat arc. 將軍 the cat is a genuine no-arc grace note, a motif, and worth flagging as such so a diagnostician does not treat him as an under-built character.

Hamartia is an error or misjudgement in action, discovered late — 阮草’s wall, the choice to carry it alone and shut 沈文 out, found out only at the reveal. A labeled “fatal flaw” the character wears on their sleeve is the mis-write; the error is a misjudgement, not a signposted vice.

The named low-point terms are not interchangeable and sit at slightly different places: All Is Lost (Snyder, an event) and Dark Night of the Soul (Snyder, the reaction valley that follows), Ordeal / Approach to the Inmost Cave / Reward (Vogler’s mid-journey death-rebirth unit), Crisis (Yorke’s knowledge turning point, which need not coincide with the 75% low point), Belly of the Whale (Campbell’s ancestor beat). They rhyme; do not equate them without noting the offset.

The case against

The taxonomy is a diagnostic applied after the fact. Typing an arc before the character’s Lie is known produces schematic figures who exist to complete a shape — the character built to be a “corruption arc” reads as a puppet resisting nothing real. The five names earn their keep as a check on a draft (which lever is this character’s climax throwing?).

Distributing five types across one cast is a direct invitation to ensemble sprawl: give everyone a full arc at once and none reaches a legible recognition. The defense is staggering the spotlight so one character’s crisis lands per installment (Spotlight Rotation).

Negative arcs are the fragile ones. Without a genuine off-ramp repeatedly refused in view of the reader, a fall or corruption reads as arbitrary and merely sad. Flat arcs carry the mirror risk: a Truth-holder who never doubts and faces no real opposition reads as a passive superhero. And under the vocabulary ceiling, negative-arc interiority cannot be paid for until B4; a fall or corruption loaded early has to be carried by external object and action alone, and if the seed is never re-cued it reads as nothing at all.

Price the method

Typing an arc spends the freedom to discover it. Fixing the Lie, the Truth, and the climax choice up front means every scene owes that spine, and a character who surprises you into a different crux forces a rewrite backward. Concretely, in this project it costs the front-loading discipline (cores committed to end of B3) and the plant→payoff bookkeeping — every payoff seeded one to two readings earlier at a lower vocabulary tier, drawn out by a curious friend, so the crisis hits a nerve already established. The steadfast flat-arc anchor costs the most inventive external opposition, since the drama cannot come from the anchor’s own doubt.

Quit signals

• The Lie and Truth are stateable but only by the narrator — the reader has to be told them, never watches them as behavior or recognition. Next move: find the concrete carrier (the envelope, the photo, the hands) and delete the statement. See Interiority Through Action and Object.
• The low point raises a bigger external threat and you cannot name what the character stands to lose internally. Next move: cut the threat, threaten identity, love, or belief instead.
• A negative arc’s ending feels sad rather than tragic. Next move: the off-ramp was never dramatized — write the scene where the Truth is offered and refused.
• The flat-arc protagonist never doubts and meets no resistance. Next move: give the world genuine opposition to their Truth, or the arc belongs on a supporting character instead.

Checkable expectations

• A planted Ghost object should discharge its payoff without exposition: 沈文’s B1L02 photo, paid off at B3L10, should land the grandmother meeting on recognition alone.
• On any negative arc, a reader should be able to point to the specific scene where the character was offered the Truth and chose against it. If they can’t, the arc is merely sad.
• A steadfast (flat-arc) protagonist should read as consistent through repeated concrete actions a reader can list on the page.
• Ask a reader what the character stands to lose at the low point. If the only answer is “their life,” the internal stakes are missing and catharsis will not land.
• The recognition should land within the beat that follows the plant — the reader feels the reversal on the page, not one scene later after being told what it meant.

Related

• The Wound and the Lie — the Ghost and Lie that every arc type inherits and diverges from at the crux.
• The Change Arc — the beat-by-beat spine of the positive arc this page types against.
• The Low Point and Catharsis — how the abyss prices the crux choice without deciding its type.
• Story Under a Vocabulary Ceiling — why arc types get rationed across the cast and cores front-load to B3.