Summary
Tatsuya serves as an infantryman within the Penal Hero Unit 9004, carrying no official criminal record despite his incarceration. He is the longest-serving hero in the unit, yet his true past and the specific crimes that led to his imprisonment remain unknown, fueling numerous rumors about his origins. To keep the contents of his skull from spilling out through a massive hole, he constantly wears a rusty helmet. Physically, he possesses a large, hunched back and typically displays a vacant expression. When commanded or addressed, he responds with incoherent groans, though observers can occasionally interpret these sounds as laughter or boasting. Because members of the penal hero unit are unable to fully die, Tatsuya has endured countless cycles of death and revival. This relentless resurrection has eroded his sense of self, causing his ability to think or speak to fade until he can only react to external stimuli with groans.
