Calibur

Calibur is the leader of the N.M.E. Foundation, and is also Shintaro's biological father.

Bio
Calibur is a Leviathan known throughout the whole Pandemonium to be one of the most ferocius and agressive beings that ever set foot in the land.

In his teenage years, Calibur was named a "beast", just like his son, Shintaro. He was always hunted down and harmed, he never felt welcomed -- until he met the Asper, Nanami Hanamichi. Calibur was Nanami's true love, and Calibur accepted her feelings. The two of them were happy, but then, Nanami's father set her up with Azaya, the leader of Aspers. Calibur tried to claim Nanami and she also wanted to be with Calibur, but was utterably rejected by Nanami's father.

Their romance did not last long, but Calibur was clueless about their sudden child, Shintaro.

Few years passed, Calibur had a journey to different parts of the Pandemonium, and he was fascinated by the different beings that showed incredible strength. He then forms the N.M.E. Foundation -- an alliance where rare supernatural beings are captured and trained to be one of them.

As he was living through the life as a leader, he gains information about Shintaro, whom he knew was his son. He then remembers the time when he was with Nanami, and after a few thoughts, he wanted to take Shintaro with him as a responsiblity for him being his real father, and his deep hatred for Azaya.