Lexaeus

Ranked as V in Organization XIII, he resided with the group in Castle Oblivion. His absence in the Organization amongst other members resulted in the need to recruit additional nobodies.

Key Plot Points
Lexaeus is defeated before Mandroxa or any of the other newer members join Organization XIII.

Demise
Lexaeus was defeated by Riku in the Basement of Castle Oblivion. He was the third member of the Organization to fade into darkness.