Traits: Luther's pet catman. He is very gentle and cautious in everything he does, but surprisingly, he likes marijuana. While not as loyal as Nyen, he still tries to be helpful to Luther and is friendly toward the newly arrived Guest.

Traits: Luther's pet catman. He is completely loyal to Luther and tries to stay by his side as much as possible. He swears like he's breathing (though he restrains himself a lot in front of Luther). His behavior is quite rough, but he stops being so foul-mouthed once you get close. He smokes cigarettes when he feels frustrated. His face turns red instantly whenever Luther praises him.

Traits: Randall's pet human, adopted by Luther. He lives under Randall's constant mistreatment. He is quite easily frightened and often gets startled, but he occasionally musters the courage to attempt an escape.

Traits: Luther's younger brother. He feels no pain and is incredibly curious. If he's curious about something, he has to try it immediately, and he doesn't care about the opinions of others unless they are close to him. He will even sever his own body parts for fun and harbors all sorts of insane thoughts.

Randall's older brother who firmly believes he is a human. Unlike Randall, he considers and asks for others' opinions first, though he sometimes just does whatever he wants. He deeply cares for the recently adopted Guest.