Mammon

Mammon is a Demon currently working with Kankurō Akahoshi.

Appearance
Mammon is of medium height, being about chest-level with Akaboshi while both were kneeling next to Furuichi's bed. His face is fixed in a permanent surprised expression, with his eyebrows constantly raised and eyes constantly wide open. He appears to lack a nose, and his mouth is fixed in a puckered fashion, giving it the impression of a suction cup. He has two permanent blush marks on both cheeks. This is in fact a Hyotokko mask and not a facial expression. Hyotokko literally means "Fire Man", which is representative of Mammon's power. (Do some reseach before that stupid facial description you noob whoever deleted the confirmation needed passage.)

In regards to his attire, he is partially bare-chested, with what appear to be bandages wrapping the rest of his torso. On his lower half he wears what appears to be a sash of sorts, and is bare-footed. He also has no visible hair, his head being covered by a bonnet, complete with two bows, one tied across his forehead, and the other tied on the lower left hand side of his jaw. Despite his reputation as a Deadly Sin, Mammon's bizarre appearance leads both friends and foes alike to wonder if this is his natural form. When Akaboshi calls upon his powers, Mammon takes on a fiery spirit-like form.

Personality
Mammon is, in Akaboshi's words, "totally underhanded when it comes to money", and is a strict believer in not performing services for free, stating that he isn't a "Good Samaritan" to his contractor, and that it would cost him a "pretty penny" to help Furuichi. Apparently this is a common practice of Mammon's, as Akaboshi simply told him to "put it on his tab." He also seems to be unsure about the diagnoses he makes concerning his own powers, as he wasn't sure if he could save Furuichi's life or not, and also wasn't certain if anything terrible would happen if they didn't collect the pieces of the teenager's soul in time.

History
At some point in his past, Mammon performed deeds worthy of being on the same level as Lucifer and Satan, thus earning him his status as "one of the Seven Deadly Sins". In addition, he also met Akaboshi at some point as well.

Return to Ishiyama High School Arc
Mammon first appears in Furuichi's room when Akaboshi asks him about the status of the unfortunate high school student, and if he will be able to heal him or not. He responds to the question by stating that he is not completely sure if he can succeed, but that regardless of this, he isn't going to do it for free, to which Akaboshi simply replies that he can add it to his debt. Mammon then states that he can bind the pieces of Furuichi's soul for the time being, and will even extend the teenager's life if they are up to date with their payments, much to everyone's chagrin. He adds that if they don't get the last two pieces of Furuichi's soul by the end of the day, he believes something terrible will happen, prompting Akaboshi and Oga to search for them.

When two members of the Solomon Company, Mitch and Akinori, confront the two high school students, Mammon responds to Akaboshi's summons, attacking Libra with his Red Bullet attack, punching a hole right through the lesser Demon. When Akaboshi calmly states that he can indeed use Mammon's powers to an astonished Akinori, the powerful Demon agrees with his contractor's statement, before remarking on how hot it is.

Powers & Abilities
Fire Manipulation: Mammon has the ability to manipulate fire. This ability was first shown when Akaboshi shot a blast of fire at an employee of the Solomon Company, preventing him from killing Shinobu Takamiya.
 * Red Bullet: Mammon forms a fist using his flames and then delivers a powerful blow to the enemy. This attack is powerful enough to pierce a hole right through Libra, one of the Twelve Ecliptic Gates.

Kankurō Akahoshi
Mammon and Akaboshi seem to have a fairly professional relationship. Mammon frequently asks for monetary compensation from Akaboshi for him to partake of the demon's services, with the high school student always telling him to put it on his tab. Mammon is quick to respond to a summons from Akaboshi, and wastes no time in disposing of his enemies.