Mikuni (三国)

He is one of the 4 Temple guardians.

During his fight with Shobu he purposely copied each move made by him in order to throw him off his game.

Along with the other Guardians, Mikuni wants Hakuoh to go back to being a calm and happy player with a peaceful mind. He wishes that everyone would just relax and enjoy dueling.

(Source: Duel Masters wikia)