Super Robot Galatt.

The story takes place in a future version of Earth where war has been outlawed and owning weapons is forbidden. A galactic real estate syndicate arrives to carve the planet up into subdivisions. To combat the invasion, a genius inventor, Dr. Kiwi, recruits young Michael Marsh, his girlfriend Patti Pumpkin, and rich classmate Camille Cashmere Jr. as fighters by upgrading the kids' robot helpers (known as Janbu, Patigu and Kamigu respectively) into powerful robot fighters. Michael's robot sidekick Janbu becomes the titular Galatt.