Hellflame is an extremely powerful Quirk that gives the user pyrokinetic abilities. The Quirk is demonstrated by Endeavor to be able to control his flames at will. Endeavor has mostly used his quirk to generate large flame blasts to incinerate his opponents and covering his body in flames. The Quirk is able to change the temperature of the heat of the flames at will to either decrease or increase its damage output as the user sees fit. In the anime, the flames can heat it up to the point where it even turns blue. Endeavor has shown to use his flames to propel movements of his fists to increase the momentum and burst flames from his legs to float in the air.
In the anime, the Quirk has shown to have more physical applications, where Endeavor has shown to be able to burn down opponents at a cellular level and easily overwhelm healing type Quirks. To shape the flames he generates into a lance to throw at his opponents at a further distance. He is also able to heat up the soles of his feet to run along walls by creating melted points in the surface.
Endeavor has shown to also be unaffected by fire as he withstood and deflected the flames that were directed towards him by an absorb and release Quirk of a Nomu.
However, a major drawback of the Quirk is that if he overuses his own flames or uses too many powerful attacks successively, Endeavor can cause his body temperature to rise too high, impairing his physical abilities; therefore Endeavor cannot battle for too long or recklessly use his Quirk.
- Flashfire Fist - Jet Burn (赫灼熱拳 ジェットバーン Kaku Shakunetsu-ken Jettobān?): Endeavor shoots flames out the back of his fist to propel it forward and delivers a powerful blow to the enemy. This was first seen used against High-End.
- Flashfire Fist - Hell Spider (赫灼熱拳 ヘルスパイダー Kaku Shakunetsu-ken Herusupaidā?): Endeavor shoots streams of fire out of his fingers to burn his enemy, the flames take the form similar to a spider's web, hence the name. The flames are hot enough to burn through High-End's muscles.
- Prominence Burn (プロミネンスバーン Purominensubān?): Endeavor burns brightly and intensely, before shooting out a beam of highly pressurized flame. This attack is strong enough to overwhelm High-End's Super Regeneration and to incinerate it. However, the creature survives by tearing off its own head.
- ↑ My Hero Academia Official Character Book Ultra Archive.
- ↑ My Hero Academia Manga: Chapter 55.
- ↑ My Hero Academia Anime: Episode 23.
- ↑ 4.0 4.1 My Hero Academia Manga: Chapter 186 (p. 17-19).
- ↑ My Hero Academia Anime: Episode 30.
- ↑ My Hero Academia Manga: Chapter 188 (p. 6).
- ↑ My Hero Academia Manga: Chapter 187 (p. 8).
- ↑ My Hero Academia Manga: Chapter 188 (p. 7-9).