The subject of consistent character design across a long-running project — a webcomic, a game, an ongoing illustration series — raises challenges that single-piece illustration doesn't face.

The construction consistency problem: over a long project, subtle character drift happens unless you've built the character from constructive understanding rather than surface appearance. If I draw a character's head slightly differently each appearance, by page fifty the character has visually aged or changed in ways the story doesn't account for.

The solution: a construction guide, not just a visual reference. Not just 'this is what the character looks like' but 'this is how the character is constructed.' Head-to-body ratio, brow-to-chin relationship, ear placement relative to eye level.

The emotional consistency problem: different emotional states require different expressions, but the character should still read as the same character at maximum joy and at maximum grief. The design must be expressive enough to show a full range without distorting the base identity.