Puddle

Puddle is Rain's pet rabbit. His first appearance was in Morning Routine.

Appearance
Puddle's fur is pure black, as are his eyes, and his species is Netherland Dwarf. (https://en.wikipedia.org/wiki/Netherland_Dwarf_rabbit) His gender is male, and his sexuality is 'neutered' (genitals surgically removed, a common practice on pets).

Beast of Doom
Puddle appeared in the dream sequence of Chapter 25. He was the 'Beast of Doom', and he belonged to the pixies (Chanel and Jessica.) He appeared exactly the same as usual, except he was giant- bigger than the humans. The pixies apparently fed people to him when they didn't want to curse them.