Xigbar

Ranked as II in Organization XIII, he is initially in charge of recruiting more members for the Organization after their number is cut to 7. He resides with the group in The Castle That Never Was.

Key Plot Points
Xigbar traveled through space in search of new members for Organization XIII and found Mandroxa and Xthanan in an abandoned church in Minipeg. He traveled with them back to The Castle That Never Was where they were iducted into the Organization.

After Mandroxa unleashes his keyblade, Xigbar is set in charge of showing him the ropes. They do most of their training in Hollow Bastion.

Demise
Xigbar is defeated by Sora and Company in The Castle That Never Was when he attempted to prevent Sora from getting any further. After his defeat, Organization XIII was reduced to just 3 of it's original members.