As a child, Toya was very energetic and boisterous, and he wanted to learn as much as he could from his father. Because his father, Enji, had emphasized that he would be the one to surpass All Might since childhood, Toya became obsessed with the goal to fulfill that dream, becoming just as stubborn as his father to become the next number one. Toya’s obsession would go on to make him further unstable, not caring about the damage his Quirk training did to his own body. He also shrugged off concerns from his sister and mother, taking Enji’s words to heart that his younger siblings lived in a different world than him. After renaming himself Dabi, he became a stoic, aloof, confident, and focused individual who rarely shows emotion. While rather crude and violent, he's actually cautious, choosing to retreat when Mirko arrived to aid Endeavor and made sure not to divulge too much information to Hawks about High-End because of the infancy of their relationship.