Haizen Aniere is a 14-year-old assassin who lives in the basement of Destroy Stadium;her nationality are unknown, although she is presumably American. She is ranked 2nd in the UAA. She drinks frequently (as is evident from her refrigerator, which is filled with nothing but canned beer; the refrigerator itself has "Chiller 7" written on it as a reference to Killer 7), dresses in a style similar to that of the Sweet Lolita fashion (which directly contrasts with her murderous personality) and bludgeons cloned men dressed in S&M gear with a baseball bat. After listening about how she feels no remorse whatsoever about killing (claiming it to just be a job), Travis takes an immediate disliking to her, saying that she is not a true assassin, but a "perverted killer". In retaliation, she claims that Travis is no better than her because although she resorts to more cruel methods to killing, they both are assassins and kill who they must all the same. She attacks Travis with her baseball bat, as well as using her bat to hit gimps with enough force to turn them into living projectiles. After their fight, she stands with Travis' beam katana sticking through her abdomen, refusing to give up. She continues to brutally assault Travis until he succumbs to the torture and forfeits the fight in order to make her stop her assault; she succumbs to her wounds soon afterward, making Travis 2nd rank regardless of his forfeiture.
