"Puffy Fluff" incidentals
Nudibranches are exotic pets featured in the episode "A Pal for Gary". They are sold at a streetside stand by a gypsy. However, they have not appeared in any episode besides this one and they look nothing like nudibranches in real life, which look like sea slugs.
Appearance (Small)
They are cute, fluffy creatures with long eyelashes and dimples. They come in the colors light purple, aqua, and light green. All have same eye color.
Appearance (Evil Creature)
Giant, slimy, angry beasts with multiple tounges with mouths (referencing either of the movies "Alien" or '"Tremors") that corrospond with their original colors. They turn into these creatures when around other animals, probably to show that they are the dominant species of their particular teritory.