Caterpillar is the larval stage of another entity known as the monarch. He is a hybrid entity, part insect and part mammal. The caterpillar is notorious for being troublesome and disruptive to both entities and survivors alike, primarily because he is essentially juvenile. He has a like for sweets and enjoys playing games, especially with other entities that take care of him. However, he often throws tantrums over things he doesn't receive. He sometimes "helps" other entities in combat.