Dabi’s fire Quirk is the ability to use a blue flame. This color of fire is proof that Dabi’s fire is higher in temperature that Endeavor’s. This is important because in chapter 202, page 8,Endeavornotes (in a flashback) that Toya’s fire was more “even greater firepower than mi...
By now, the manga has made it clear that Dabi was born as Toya, the eldest child of Endeavor and Rei. ... By the time this was discovered, Toya was too obsessed with his father's vision to let go, so he would train in secret without anyone around. It wasduring this solo training...