Philomela

Momo-chan
A cat/human girl who existence was made due to a cats soul combined with a humans 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 Mikis body as her own for unknown reasons. Source: Devilman Wiki