Gaia

Gaia made his first appearance in Battle Arena Toshinden, as the unlockable final boss. He then appeared as an initially playable character in both Battle Arena Toshinden 2 and 3.

He was an elite member of the Secret Society; a criminal organization that sponsored the Toshinden tournaments. However, when one of his co-workers, Uranus, learned that he had held the first tournament without the approval of the organization, she branded him a traitor and marked him for death. However, he escaped and went into hiding.

One year later, Gaia received an invitation to participate in the second tournament. He reunited with his long-lost daughter Ellis and entered the tournament with her, hoping to get revenge on Uranus. At the end of the tournament, they were successful in destroying her and the Secret Society with the other fighters. However, Gaia then discovered that he was being targeted by the Organization, a long-time rival group of the Secret Society. He entered the tournament hosted by the Organization with Ellis, in order to help bring it down.

Source: Wikipedia