Akechi Mitsuhide

Akechi Mitsuhide (明智光秀) is a samurai and general under Oda Nobunaga during the Sengoku period of Japan. He incidentally found that true identity of Nobunaga and thus turn against Nobunaga to prevent Japan falls into Devil's hand. He then meet Momotaros from the future and team up with him.

Mitsuhide turn against Nobunaga is a reference to the in the real world.