Ansem the Wise was a famous scientist and sage-king of Radiant Garden. To protect his people from the darkness, he and his apprentices performed research and experiments to study the heart, which resulted in the creation of the Heartless. Eventually, Ansem's apprentices were taken over by the darkness, and, when he decided to end the research, they banished him to the Realm of Darkness and Xehanort continued the research in his name.
Kamui is a skilled ninja who has left his clan, seeking freedom in an oppressive society.
Earth-type Legendz. A member of Greedo's group, G-W-Nicol. http://en.wikipedia.org/wiki/Legendz:_Yomigaeru_Ryuuou_Densetsu
She is an Esper of unknown level who is a part of SCHOOL. Her ability name is Measure Heart. Her name has never been disclosed. She is usually described as a beautiful girl in a showy dress that looks for about 14 years old. She seems to be interested in Kakine Teitoku's plan of negotiating with Aleister. She shows reluctance when fighting an enemy when she can not foresee how their hearts are going to behave, and has has displayed a certain amount of mercy within the battlefield, showing something that might be described as respect in front of Shiage's and Rikou's protective behavior while they are faced with danger. Outside combat she seems to act a little frivolous, using her showy appearance to earn extra money. (Source: Toaru Majutsu no Index Wiki) (Updated by Aezile of Toaru Majutsu no Index club)
A member of the assassin group Bandersnatch. Rare is an effeminate of short stature. Rare collects the hair of his victims.
Age 26, a handsome blond man from the Erebonian empire who claims to be a traveling musician. He is indeed blessed with great music talents on almost all instruments, but is also extremely carefree and has peculiar tastes. Some of his antics include drinking an incredibly expensive wine after giving a performance at a local restaurant (which gets him in jail) and making several passes at all other attractive characters(in his eyes, he is the Hunter of Love). (Source: Wikipedia)