Fear Goblin

Isaac has a pet fear goblin, who is simply called fear goblin. She looks vaguely like a black cat with five yellow eyes and tentacles. She causes nightmares for Val, Minnow, and Isaac before Isaac tells her she's been a bad girl for doing that. She seems to have some kind of perception altering abilities because Val and Minnow seem to notice fear goblin after their nightmares, but then fear goblin disapears.

Val and Minnow confront Isaac about his fear goblin getting too big, as it is shown to be about as tall as most characters with a body now covered in yellow eyes and has been causing everyone on board to suffer paranoia and anxiety. After this, the fear goblin is shown to consistently communicate in word bubbles with two characters at a time.

Emotion Goblins are banned from playing wizardball. Despite this, Isaac used his fear goblin in a game.