Saïx

Saïx, the Luna Diviner, is the Nobody of Isa. He is Rank VII within the original Organization XIII and a member of the real Organization XIII. He derives power from the moon, and uses this power to enter a berserk rage where he mercilessly attacks opponents with his massive claymore. He commands the Berserker Nobodies.

In the original Organization, Saïx serves as the second-in-command to Xemnas, and is a major antagonist in Kingdom Hearts II and Kingdom Hearts 358/2 Days. Fittingly, Saïx is the second-to-last member of the first Organization to fall. Along with all other original Organization members in Kingdom Hearts 358/2 Days, Saïx is a playable character in Mission Mode.