Genbu

"Madou, showing demented pity for his former host."

- Y-Y-Y-You weren't scared of me, so I wanted to get out gently, but... O-O-Ohh... You're like this now... I'm sorry... Amen, amen... T-T-There's your prayer. W-W-Well, let's pull myself together since I'm a strong boy.

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.

His most notable feat is his creation Genbu Castle, an interdenominational space where the normal laws of physics don't apply.

He was eventually killed by Rance and his forces.

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.
 * While he does not physically appear he can be considered one of the main antagonists of Rance 5D since he created Genbu Castle and is indirectly responsible for pretty much every event in the game from Rizna's suffering to Dark Rance's conception.