Achilles is a cadejo and Antigone's pet. Unlike others of his kind, Achilles is half black and half white with one blue and one red eye.
He is first found by Antigone as an escaped creature from the beastery roaming the wastelands. Antigone immediately befriends him and calls him Achilles because of his bold nature. He is very clever and sneaky, often making him silly and wily. He also appears to be caring for his master as seen hugging her when she cries for her sister.
Achilles is able to make demonic sounds and breathe fire.
Trivia:
Achilles is named after the hero, Achilles.
He is the second character to be named after the hero of the same name, the first being Achlys (only his name is pronounced differently).