Exosuits

Exosuits are a type of high-tech armor that is used by members of the Exonaut Academy. All, save six, are based off of Cartoon Network Heroes. The Exosuits use various types of guns to fight each other, along with Helix Grenades and Heavy weapons. In a 2013 update, gold versions of some suits can be unlocked.

Concept Art
Original source: https://www.behance.net/gallery/3743853/Cartoon-Network-Project-Exonaut