Megumin

Megumin

めぐみん
Age: 13–14

An arch wizard who is descended from crimson demons; powerful humanoids who possess black hair and red eyes, and sport chuunibyou characteristics. Megumin only knows a single skill, the incredibly powerful explosion magic that immediately incapacitates her for the rest of the day when cast, and refuses to learn any other skills.

(Source: Wikipedia, edited)