What's the best way to handle negative prompts when creating AI character sheets, and are there any tools or workflows that help manage the specific failure modes they're meant to prevent?

Handle negative prompts on character sheets as locked, repeated constraints — not per-image afterthoughts. Strip objects from characters' hands before generating turnarounds, write explicit prohibitions into your style block ("not live action, not photorealistic"), give the negative prompt a fixed slot in every prompt's assembly order, and store it in persistent agent context so it applies to 100% of generations.

Start with the failure mode most specific to character sheets: objects in hands. Anything a character holds replicates inconsistently across the angles of a turnaround sheet, so remove held objects before generating multi-angle sheets and give props their own reference pass — one documented production covered 4 characters and 1 prop with just 11 images by sheeting the prop separately instead of fighting it across every angle.

Next, write your style-level negatives as explicit prohibitions inside a reusable style block, and prepend that block to every prompt. The production that locked a hand-painted animation look wrote the exclusion directly into the constraint — "This MUST look and feel like Arcane animation — not live action, not photorealistic" — and then applied it without exception: "Every prompt after this started with it." Naming what the output must NOT be is what stops the model drifting back toward photoreal defaults across a multi-sheet, multi-scene project.

Then give the negative prompt a fixed structural slot rather than improvising it per image. Documented productions use a 9-element prompt assembly order that ends with the negative prompt, and one workflow had the invideo agent output 12 parameters per shot — including a negative prompt and a revision prompt — for every single request. The invideo agent is built for exactly this management problem: invideo is an agentic video creation tool with all the current image and video models available, and once you store your negative constraints in its project context, it carries them across every generation and every model without re-typing — one director-style reference document encoded into agent context dedicated an entire section to negative prompts out of its 14 sections.

Exclusion also applies to your reference inputs, not just the text string. When you feed reference images for a character or world, batch them by theme and tell the invideo agent explicitly what to adopt and what to ignore from each batch — one production fed reference stills with instructions to extract only a single concept and discard the rest of the image's logic. Exclusion instructions on inputs prevent the contamination that a text negative alone can't catch. The complement worth one line: a model invents whatever your sheet doesn't show, so include close-up panels for small details (scars, accessories) and keep the character fully visible rather than relying on negatives to suppress what the model hallucinates into hidden areas.

Two workflows then manage the failures negatives don't fully prevent. Before video generation: generate 4 options per character sheet, pick the best, and lock it — a 70-second short film kept 2 characters consistent across every scene with this locking step and agent context alone, no LoRA fine-tuning. After generation: when a continuity error still appears in a shot, don't re-roll the shot — ask the invideo agent to inspect the character sheet itself. In a documented case it identified the exact panel in the grid containing the error, corrected it at the source, stored the updated sheet in context, and regenerated only what was needed, so every subsequent shot inherited the fix. Budget for iteration even with negatives locked: one production averaged 5 generations to lock each character, about $9.78 per character.

Watch some of these to see what works for you:

This MUST look and feel like Arcane animation — not live action, not photorealistic. Every surface has hand-painted brushstroke texture. Every element in frame must feel painterly and handcrafted like a moving Arcane frame.

— invideo's creative team, style-block constraint from a documented animated production