Son of Doctor Kenneth Onishi (Daichi Ōnishi) (voiced by Kirk Thornton), Koji allied himself with the Autobots after his father was kidnapped by Megatron, offering them advice and knowledge about Earth. A bright child, Koji has learned a lot about archeology from his father, though he possesses no special powers, beyond a startling knack for being right where he needs to be, in the middle of coincidental Predacon attacks. When Dr. Onishi was freed from Megatron's clutches, it seemed Koji's role in the Transformer war was over, until he found himself able to control Fortress Maximus.

(From Wikipedia)