Nami Kusunoki

She has the power to freeze the water from anything (ground and air) into whatever shapes she wants, such as projectiles (including wolverine claws). Her younger brother, Satoru, was killed by the "comrade" Kanon after he accidentally bumped into her and proceeded to run down an ally, at which point Kanon used her ability and caused the vehicle beside Satoru to explode. He burned to death before Nami's eyes. She seems to be an expert fighter with a grudge against Yuta and Kanou, with intent to kill. She hates fire and other people with powers because of that. She tags-along with Yuta and Kanou so that she can kill the woman who killed her brother. She intends to kill them both after she finishes her quest. However, the kindness of Taisuke changes her from an avenger to a kind-hearted person. It's also possible that she has some feelings for Taisuke as she names him as her reason for living in the second arc. From Wikipedia