Philomela

A cat/human girl who existence was made due to a cat's soul combined with a human's body. She follows Akira and Bakarasu, on their journey around the apocalyptic landscape. Later, it is revealed that she is actually Philomela, a creature with the lower body of a large cat and the upper body of a human with cat ears. She is one of Hades' servants, and is using the rest of Miki's body as her own for unknown reasons. (Source: Devilman Wiki)