Tomohiko is a large man with a powerful build and stern facial features. He has his dark hair tied back in a short ponytail, with the strands spiking outward in many directions. His Hope's Peak Academy uniform was noticeably unique, including overalls, a dress shirt with the sleeves rolled up, and a yellow tie. Tomohiko appeared to be a quiet and reserved man; despite being visibly nervous, he reacted calmly when Junko Enoshima revealed she had blackmail material on them. Even during the Killing Game, Tomohiko was able to stay calm enough to trick Aiko into lowering her guard around him. However, he also had a ruthless side, as shown when he betrayed and killed Aiko to use as a distraction for Asukasei. When he started to strangle Asukasei, he appeared to have a psychotic grin, though this was likely due to him falling into despair.