Isa

Isa (formerly known as Saix) is an antagonist in the Kingdom Hearts series. Isa is very calm and stern, often treating his position as second-in-command of the Organization as being of the utmost importance. When he was younger, Isa exhibited much more emotion, often teasing his friend Lea and joking around with him. Isa's home world is the Radiant Garden, where he was best friends with Lea and kept brewing plans to sneak into the castle with little success. During battle, Saix wields a massive sword called a claymore and draws power from the moon. He also has full control over the Berserker nobodies. During the events of Kingdom Hearts 358/2 Days and Kingdom Hearts II, Isa was a nobody bearing the name Saix, presumably created after he lost his heart at an unknown point in time when the Radiant Garden was lost to darkness. Isa will return in Kingdom Hearts III as a member of the "true" organization.