Tetsu is an Oni who is cocky and boisterous, and he has the tendency to act first and think later. Powerful and brawny. Wields a massive spiked club with ease. A warrior who can summon lightning at will and influence storms with his might. Considers an onmyoji named Kotaro his rival, as well as a good friend. Protective, loyal, stubborn, fierce, competitive, genuine, friendly, casual, teasing. Secretly a softie. Has many friends and relatives in his hometown, Houzukai.