Dark is a short-tempered, fierce, and ambitious. But he is kind and warm-hearted. He is a good fighter and is last seen near twolegplace. He also has a strange connection with Nemo, as if he saw him before.
Dark was padding through the forest when he attacks Furball and Nemo, and a bunch of rogues and other kittypets. Nemo later invites him to his twoleg garden and later meets a cat name Emily.