My quest for niche characters has found someone truly in the background - those smexy rats dancing in the background of Hakos Baelz from Hololive's latest music video "Snake Eyes". Surprisingly un-cringe for Vtuber music, too (though that might just be me not understanding the Korean).
The main trigger here is Snake Eyes Dancer.
The descriptive tags are something like rat girl, rat tail, tail bow, animal ears, rat ears, blindfold, short hair, black hair, colored inner hair, black shirt, midriff, navel, black shorts, thighhighs, collar, thigh strap, fingerless gloves, black jacket, black footwear
This works in both Pony and other SDXL-Based checkpoints like Illustrious or NAI. See the effing previews. So don't bother asking for extra versions, just git gud (or rather, activate advanced settings in Generation Settings in your Profile, you scrub, and stop demanding to be spoonfed).