Yuuki Oonishi  

Koji Onishi, 大西 勇気

Dr. Daichi Oonishi's son, Yuuki, aligned with the Cybertrons after his father was kidnapped by Gigatron. Despite missing his dad dearly, Yuuki formed friendships with many of the Autobots and often visited their headquarters as a cultural ambassador to help them comprehend Earth's society and history. As an intelligent child, Yuuki has gained knowledge about archaeology from his father, although he lacks special abilities beyond being in the right place at the right time during coincidental Destronger attacks.