From Soul Eater. Cosplayer is Anna Ruiz.
Commonly referred to as simply "Kid", is the second son of Death himself and the Meister of the Demon Twin Guns, Liz Thompson and Patty Thompson. Created from a piece of Death himself, Death the Kid is known to be one of the top 3 students in the DWMA. After his father's death at the connection of the Lines of Sanzu and Asura's defeat on the Moon, he inherits his late father's position as leader and headmaster of the DWMA. He is one of the main protagonists in Soul Eater. (souleater.wikia.com)