Suiten Ikaruga

Suiten, formerly known as Ikaruga Nazuna (斑鳩 薺), is a resident of Decapitation Island. Suiten has a normal personality, but she will get violent when somebody doesn't obey her rules and she gets even more violent when she is drunk. Suiten used to be an Ishiyama High School student along with Zenjuuro and Shinobu (Aoi's mother), during this time Suiten went by the name Nazuna. She also used to be the leader of Team Valkyrie who were feared as the strongest female gang in all of Kantou. (Source: Wikipedia)