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. 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://civarchive.com/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