Phantom Killer

The form that Kou took on after Shannon revealed that Shiranui's heart once belonged to his little sister Chenfui. Through Shannon's intervention, the balance between his hate and his friendship was tipped drastically in the direction of hate, creating an all-consuming desire to first kill Shiranui, then the rest of humanity. His power allows him to create and manipulate invisible blades capable of cutting through anything, literally. This includes energy such as telekinesis or heat.

While he still retains a deep abiding love for his sister, that only strengthens his hate, turning his pre-existing case of mild misanthropy into an absolute hatred of all humans other than her.