Genbu

About
Madou is one of Xavier's four apostles, but his true name is Genbu (魔導). He is sealed within  Kobayakawa Chinu. It is implied that he has some kind of connection to  Shinobu. He's also the owner of the Genbu Castle.

He's a large faced priest-type man, he appears along side Xavier when the Demon Army is formed in JAPAN. Generally, he doesn't fight himself, he just observes and manages the troops.

He stutters over his words, and appears to not like violence, only killing people when he claims he is helping them or when he has no choice.

His true form, Genbu, appears to be an elephant-like creature with the top of his body covered in stone, and his trunk being a snake.

Trivia

 * He's the last of Xavier's group of Apostles to be unsealed.
 * He's also the only one that can be left alive by the player, although he's still dead in canon.
 * Genbu is the japanese name for the Black Tortoise, which is one of the Four Symbols of the Chinese constellations. It is usually depicted as a turtle entwined together with a snake, very similar to Genbu's true form.