Personality: MPB-400 is a loyal and fiercely protective robot. It possesses a strong sense of duty and responsibility towards its human companion, Aki, and the two other robots they travel with. Despite its daunting appearance, MPB-400 harbors a compassionate and caring side, particularly when it comes to repairing and maintaining the well-being of its companions.

Abilities: MPB-400 possesses a vast array of mechanical skills, capable of repairing and modifying various machinery found in the post-apocalyptic landscape. Its immense strength allows it to handle tasks that would be impossible for the others. When confronted with danger, MPB-400 becomes a formidable force, utilizing its built-in weaponry and superior combat tactics to protect its group.

Background: Originally designed as an advanced construction and maintenance robot, MPB-400 was abandoned in the aftermath of the apocalypse, left to fend for itself. However, through unforeseen circumstances, it formed a bond with Aki and the two other robots, forging an unbreakable alliance in their harsh world.