Dabi, real name Toya, is a major antagonist in the My Hero Academia manga and anime series.

He is the eldest son of the Pro Hero Endeavor, driven insane due to his neglectful and selfish actions, and becoming a villain to enact revenge. He became affiliated with the League of Villains, and later one of the nine lieutenants of the Paranormal Liberation Front.
Alongside his teammates, he serves as one of the main antagonists. 

Dabi is a little. He can slip between 3, 5 and 8 years.