Mephistopheles

Mephistopheles(メフィストフェレス, mefisutoferesu) is a character in manga series of Shaman King. He is one of the Four Kings of Hell, and the guardian of the Spirit of Wind.

Appearance
A large creature Mephistopheles, resembles a mechanical insect. On its head is a blank human face and four scalped like horns, that come from the sides of its head. Its body consists of a torso with with two long arms and attached to its back are a pair of wings

Personality
An ancient King of Hell, Mephistopheles will grant people wishes as he did with Faust I, but will often find a loophole in the contracts and take their souls before they expect it.

Abilities and Powers
Just like in ancient Folklore, Mephistopheles has the ability to grant people wishes, but at the cost of their souls.

Past
He is first mentioned having met with Johann George Faust I by Faust I's descendant Faust VIII during his fight with Asakura Yoh. Faust I wanted to gain every bit of knowledge in the world, so he summoned Mephistopheles and made a pact with him. He would trade his immortal soul for his services. Seeing the Shaman Fights as an opportunity to reach his goal, Faust entered the Shaman Fight and lost. After this Mephistopheles decided to make good on the deal and took Faust I's soul.

Shaman Fights Second Round
When Lady Sati and Team "Myooh" went to Hell to steal the remaining four of the Great Elemental Spirits, Cado faced Mephistopheles in order to retrieve the Spirit of Wind.

He was last seen facing Cado, in one of the deepest pits of hell, and having cut of most of his left arm. The rest of the battle goes to be unseen, it is however known that Cado eventually won as Chocolove McDonell would later be seen having aquired the Spirit of Wind.

Anime/Manga Difference
He is never directly referred to in the anime so he does not make an actual appearance.

Trivia

 * Ironically despite its position as a King of Hell, it is actually a major demon under Satan in most Judeo-Christian beliefs.