From the "things that absolutely should exist, but inexplicably don't" department: Higurashi-era Ryukishi07 sprites for Illustrious.
This is a style LoRA, but the characters are tagged by name if you want to be specific. This also makes it work as a character LoRA, but not a particularly good one. It has never seen a full body so YMMV on anything that is wider than a cowboy shot.
It has a tendency to create fuzzy artifacts around the characters on dark backgrounds, which are probably due to the sprite's alpha channels not being very clean. But hey, at least with this one you won't need to worry about AI hand jank as much, flesh mittens ftw.
Note that using this with base models that have strong stylistic preferences for "professional" looks may be counterproductive - but then again, this with more polish just ends up looking like Umineko sprites. Similarly, for the "best" results do not add any quality tags. Ryukishi is not "masterpiece", nor is he "very awa".