Hades

The lord of the Underworld. He has a very short fuse and is in league with the Heartless and Maleficent in an attempt  to take over the universe.Aside from Maleficent, he is the most  powerful  of all the allies.He tricks  Cloud  into entering the games so he can kill Hercules and now Sora  and his friends in exchange for him  leading Cloud to Sephiroth, who is indeed at the Coliseum.