Peacekeeper

The Peacekeeper is a robot powered by the mysterious "Red Core Energy" built by President Stone. It also has "Prototype Adaptive Technology" that allows it to take in other things and objects. Originally built to help Stone get re-elected (reason unknown), due to his core he started destorying Metro City, and Astro had to shut it down.

Trivia
For comic relief, there is shown to be a toilet on its back.