also known as the "Luna Diviner" , is a Nobody with an X-shaped facial scar and wields a claymore called "Lunatic". He draws power from the moon and controls the Berserker Nobodies, who wield weapons similar to his.
Saïx first appears in Kingdom Hearts II at Hollow Bastion along with the other members. He appears again in Twilight Town after Sora defeats his Berserker Nobodies and warns Sora of Axel's intention of turning him into a Heartless. After Sora defeats the Heartless army at Hollow Bastion, Saïx appears and explains Sora's purpose in the Organization's plans and refuses Sora's request to meet Kairi, whom Saïx kidnapped prior. After Saïx summons a horde of Nobodies, Maleficent attempts to use her own Heartless to battle Saïx, but his Nobodies quickly dispatch them and overwhelm Maleficent. On his climb through the Castle That Never Was, Sora confronts Saïx. Saïx fights while in his berserk state by absorbing the moonlight, but is defeated.