Dabi

Toya completely broke, to the point where he abandoned his past self and became Dabi, a maniacal villain that not even All For One could bring under his command, obsessed with taking down Endeavor, and willing to sacrifice anything to do so, including his own life. Dabi's rude and derisive demeanor keeps others at a distance so he would focus on his objective but also puts walls around himself from other people.