Mako Fujisaki

Mako Fujisaki, also known as Valkyria, is the main antagonist of the manga and anime Gokukoku no Brynhildr. Mako is implied to have been a normal Japanese girl until she was kidnapped by a secret military organization and implanted with an alien parasite in a similar manner to numerous others, including the main cast of the anime. After both Saori and Kikako, another "witch", fail to eliminate Kuroha Neko and the other escaped "witches" who escaped and were subsequently hidden by series protagonist Ryouta Murakami. Fujisaki's powers are massive, being able to use ten abilities, rather than the one or two of most "witches", and is theoretically capable of destroying the entire planet with her antimatter generation powers. Fujisaki was supposed to be held in check by a dozen other witches with power-limiting abilities, however Mako managed to kill all of them and escaped. Shortly afterwards, she demonstrated her powers by generating a piece of antimatter on the a mountaintop viewpoint. Mako teleported away as the antimatter created a nuclear-level explosion which destroyed the entire mountain. As of this point, the manga is ongoing.