Akio Fudou  

Caleb Stonewall, 不動 明王

The character you're referring to is a skilled player with exceptional technique and strategic thinking abilities. He first appeared in episode 37 of the anime as part of True Teikoku Academy. In season three, he collaborated with Kidou on Killer Fields and Koutei Penguin 3gou. In the movie Koutei Penguin 2gou, he worked alongside Kidou and Kazemaru. He also participated in Ares no Tenbin's Twin Boost with Sakuma. Additionally, he teamed up with Hiura, Haizaki, and Kidou for Maximum Circus and Death Crusher Zone in Orion no Kokuin.