Decided to try doing a themed multi-character model to save on disk space and allow character/concept mixing with a single LoRA. Like the name says, this is about sludge and mud characters. Let me know if there are any relevant characters I should add in the future. Here are the characters, grouped by how well they came through (results may vary with many stacked LoRAs or on heavily fine-tuned checkpoints):
Reliable:
Hexxus (Fern Gully): Two main variants, faceless monster and slime girl
faceless: hexxus slime monster, brown slime, long neck,
slime girl: hexxus slime girl, brown slime,
(The IL/Pony model for Hexxus that inspired this: https://civitai.red/models/687884/slime-hexxus-ferngully-the-last-rainforest)
Muk (Pokemon): Anima fine tunes that are trained on Danbooru may not need this for the Pokemon Muk, but base Anima and non-Danbooru fine tunes seem to benefit from it. Didn't find enough art on grimmer specifically to split that off from muk.
Pokemon: muk
Slime girl: muk, slime girl, personification, purple sludge
Alolan Muk (Pokemon): Likewise not needed for some Danbooru trained fine-tunes (e.g. Silvermoon). Includes slime girl version in addition to the pokemon.
Pokemon: alolan muk, rainbow slime,
Slime girl: alolan muk, rainbow slime, slime girl, personification
Clayface (DC comics):
clayface
Unreliable:
Plasmus (DC comics):
plasmus monster, tentacles, goo monster, extra eyes (unsure which of the extras are necessary)
Barely present:
MHA Sludge Villain (My Hero Academia):
MHA sludge villain