Nerdy Nereid looks badass cosplaying as Captain Mizuki from the superhero manga / anime series One Punch Man! Mizuki is a famous track and field champion who decided to become a hero. Also known by her hero alias Captain Mizuki, she is the B-Class Rank 71 professional hero of the Hero Association. As you can see by this cosplay vs character side by side, she absolutely nailed her look:

Cosplayer: Nerdy Nereid

(via: Geek Girls)