Saïx

From Kingdom Hearts - Wiki on Neoseeker

Saix
Games	Kingdom Hearts II
Weapon	Claymore
Age	Unknown

Saïx is a member of Organization XIII. He first appears in Kingdom Hearts II. He was a key member that orchestrated the Organization's plot to use Sora to create Kingdom Hearts. He actually reveals this plot to Sora at Hollow Bastion, just after Sora defeats one thousand Heartless in a great invasion of the world. Saïx is later seen pursuing a fleeing Kairi and he is fought of by Riku. He hints to Sora that Riku had returned while he was advancing through the Organization's stronghold. After uniting with Riku and Kairi, as well as King Mickey, Sora defeats him in battle.

You fight him in The World That Never Was. His weapon is a Claymore, similar to those of the Berserker Nobody and he has its Berserk power, however, he commands much more power with his. When you fight him during the fight, he says: "Do you feel the moons power?" and "I would like to see you die fighting." His distinguishing features are an X-shaped scar on his face and his light blue hair. Saïx is also a nobody like the rest of the members of Organization XIII.