Flippernino said:
You're right. They're separate characters, so it's not dual persona.

It's a 2nd Iku with another personality. Whether it's an actual persona or a fanon identical sister has no importance for tagging purposes. It makes much more sense to use dual_persona here rather than anything else.

Raising an issue I'm seeing with dual persona here and there.. I'm seeing posts like post #890366 and post #891603 which just has the same character depicted more than once in the same costume and no visible alternate persona getting tagged with persona tags. Honestly, I think even posts with multiple costumes should only be tagged dual/multiple persona if there's some kind of theme or contrast associated with it. Something like post #889830 (explicit), for example, doesn't seem like a case of multiple persona.

dual/multiple persona currently covers: canonical alternate personas (either secret/alternate identities or alternate personalities), fan-made personas with a large following (slightly varying miku clones), personas implied through contrasting colors or other themes, genderswaps...

I'd like some input on the three cases I linked and whether they should be tagged with *persona or something else. 1) Same character, same costume, no visible persona change. 2) Same character, same costume, different expressions but no obvious contrasting theme like good and evil. 3) Same character, different costumes, no visible persona change.

I'd say if there is an implication that a character could interact with another version of themselves (two versions in the same scene), and nothing involving time paradox is going on, dual persona is appropriate, even if the costumes and personalities are the same.

Where multiple versions of a character with the same personality and costume exist, and no interaction should be expected to take place (there is no "scene", or there are just a bunch of character sketches), dual persona/multiple persona is not appropriate. Those sorts of images are typically tagged character sheet. I'd argue that your examples probably fall into this category.