Astaros is the main antagonist from Robo Aleste.
Astaros is a mysterious woman who manipulates the Anti-Oda Alliance from the shadows. She resides on a castle in a different dimension and only communicates directly with Motonari Mouri, providing the Alliance with many powerful weapons with the only apparent objective being to kill Nobunaga Oda at all costs.
Her true objective is only revealed at the end, after she is defeated. She reveals that Nobunaga was actually the incarnation of the Devil, and that she created the Alliance to prevent him from destroying the world. Before dying, she urges the protagonist Kage Okami to kill Nobunaga and save the world.