J

A cunning, evil and treacherous demon. Tall, he has the legs and tail of a lion, bird wings, ornate horns and three golden eyes. At the same time, he has an almost human smooth chest and arms with a neck and face. He has very long blond hair and pointed ears. He does not tell anyone his real name (Jonathan), as it is not accepted in the demon world. Everyone knows him as J. He has a lot of secrets that he won't reveal to anyone.

From the manga: Appearing, J speaks that Makoto's ardor is praiseworthy and he is impressed that someone his age has full mastery of the art of summoning a demon. Asking to hear what Makoto wishes for, J says he can grant it, in exchange for his life. Taken aback at Makoto's wish J speaks how as a high school boy he should want things like throwing away his virginity or getting back at any bullies. Noticing Makoto's books concerning bizarre murders and cannibal stories J sees where he gets his ideas from. Stating that he will not tell Makoto's father, J encourages Makoto to throw them away. He indulges Makoto's desires and is able to tear his own skin apart around the neck. An archduke in the world of demons J takes Makoto where he will raise him as a demon to be adored by him. He will not give Makoto any demon traits, when he becomes a fine demon that should be his own discretion. Instead J hands something pure gold which is an item he received from his mentor. With Makoto nervous and shouting at him J commends him and states he has a good future ahead. When Makoto asks for a hug J obliges and thinks he is very cute. J mentions to Datenshou how he expected Makoto's spirit to break on the first day but he even had the guts to clearly tell him what was on his mind and J adds that he is amazing. Clarifying what Makoto said about not becoming a demon J changes from darkly rumbling to applauding Makoto's level of conviction. However J moves on to say he can pierce it and reminds Makoto whose possession he is in. He describes souls like precious jewels and if their quality drops they will be no better than common pebbles. J adds that Makoto's was quite the nugget and he debated with himself for quite a while as to whether he would turn it into gold or raise it. Remarking that humans cut down forests for scraps to make paper currency and whittle down mountains to dig out the treasure inside, if they disappeared completely humans would be troubled, but one at a time does not matter much and it is how demons see humans as. His definition of affection is skewed or has changed since J works to have Makoto become a demon on par with him which involves hating him.