Mephisto Pheles (メフィスト・フェレス Mefisuto Feresu)

Mephisto Pheles is the Chairman of True Cross Academy's Japanese branch (using the name, "Johann Faust V" (ヨハン·ファウスト第五 Yohan Fausuto Daigo), in public). He is portrayed as a man with more money than sense but is very cheap when it comes to spending on others. After Shiro Fujimoto's death, he is ordered to kill Rin but instead accepts Rin's proposal of becoming an Exorcist and enrolled him into True Cross Academy.[ch. 1] Mephisto is a powerful exorcist (holds a Meister in Honorary Knight, was able to subdue Amaimon while holding a berserk Rin off) and claims that he desires to "bring peace to both Assiah and Gehenna". Despite having served the True Cross for at least two centuries, elements of the Order still consider him suspicious. Their mistrust has its reasons as during the series it is hinted that indeed Mephisto has some secret agenda which involves Rin, working behind the scenes regarding the events around him since he joined the order. Mephisto says Assiah is the best playground for him; he fully enjoys Japanese culture, being a big time otaku with a large collection of anime-releated items.

Just like Amaimon, Mephisto is a son of Satan and one of the "Eight Demon Kings", originally known as Samael, the "King of Time". His ability of transforming into a small dog or conjure a giant cuckoo clock is just a sample behind his true powers that allows him to control space and time. Mephisto is suggested to know what will happen, likely due to being King of Time. He is voiced by Hiroshi Kamiya[1] in Japanese and Sam Riegel in English, while in VOMIC he is voiced by Tōru Ōkawa. In the Blue Exorcist musical, he was portrayed by Yūya Nakahara.[3]