Axon

Axon is the main antagonist of Kingdom Hearts: Heartspawn. He is the leader of the nobody group, The Final Six.

Pre KH:H
At some point in his life, a man named Nao lost his heart. His nobody became Axon, one of six secret experiments of the late Organization XIII. He was trained by Xemnas and Zexion. Shortly before the Castle Oblivion incident, Axon and the other five experiments were stored in sleeping pods to preserve them for the future if the Organization failed their goal. He and the other five awoke fourteen years later and formed the final six.