Anti

A sentient kaiju created by Akane that is able to copy his opponent's abilities. Anti displays an irrational hatred for the Hyper Agent in both his human and kaiju forms. His hatred is so great, Anti will even attack a fellow kaiju if they stand between him and Gridman.
During the tenth episode, Anti's obsession with defeating Gridman evolved into a desire to protect him. This, combined with Anti's own copy ability, transformed Anti's kaiju form into a Gridman-like form dubbed Gridknight