Kouha appears as a young boy with an androgynous aspect. He has long pink hair, short in the back and has three braids on his fringe, and pink eyes. He also wears a blue hat with a design on it that has golden wings, two long red veils and a white chinese-like dress with a pair of shorts. He also wears two golden bracelets, each with a green jewel, but his Metal Vessel is his sword.
He appears to enjoy hitting his attendants, especially the females. He also has a twisted personality commonly known as "yangire" in Japanese - and takes pleasure butchering his enemies. He also loves the sight of blood and is well known in Kou Empire for his eccentric personality.
Kouha also has a nice and extremely caring side to him, especially towards his attendants. When they were thrown away and left to rot, Kouha came to them asking for magic users. He bandaged them, clothed them, smiled at them, and appointed them. Though they think they are ugly because they have to be bandaged up, Kouha tells them that they aren't ugly, that it is proof that they have seized their power and paved their way of life, and adds that it's charming. This is why his servants love him so much now, and even ask to be hit by him.
Aside from that, Kouha is loyal when it comes to his older brothers. He respects them and is willing to support them the best he can.
Kouha is the third and youngest son of the First Emperor's younger brother, Koutoku Ren. He does not share the same mother as his brothers Kouen and Koumei, who have the same mother.
After the death of the Emperor and his heirs in a fire, Kouha's father became the Second Emperor, making him the third Prince.
When Kouha was a child, against the advice of older people, he chose outcasts and odd people to be part of his army; ones that were failed experiments of artificial Magicians—such as Jinjin, Junjun and Reirei, low standing swordsmen joined or born to various clans, and warriors who were exiled into the wilderness after their ancestors planned a revolt 120 years ago.
People started to talk about Kouha. They would say that it is to be expected that Kouha would gather twisted people. They said that since his childhood, he had an eccentric personality and liked the sight of blood. They also said that this must be from the fact that his mother lost her sanity for a long time, and that even if he becomes a general, its impossible for him to be suitable as Kou's Emperor.
Kouha tells his subordinates that the country isn't expecting anything from them, and that the way things are now, they can live their lives in shadows. He says, "But if you wanna go someplace where you and your family can have a future you can be proud of, to a brighter place where you can live with dignity, then... You must know no shame. Raise your heads and fight!" He says that they are lucky, and that they have people who want to do these things with them. Kouha says that his brothers En and Mei already took care of him, so now he'll take care of them. Then he asks if they're are any idiots who want to try and raise their stupid mugs.
At the age of 15, he was present in the treasure room of the 14th Dungeon, Leraje, with his brother, Kouen, and their subordinates who came to conquer the Dungeon. The Djinn, Leraje, told Kouha that if she was a normal Djinn, she wouldn't chose him, but the sexy guy standing on his side (Kouen). She says that Kouen is a cheater that already controls 3 Djinn, and she swore to stop falling in love with playboys like him. Kouha asks what she means, and adds that her make-up is shitty and she has the face of someone who was just left by her man. Leraje says shut up, and that she doesn't want to see a world that's ruled by a single and absolute king. She wants to see a king, and his strong retainers that wouldn't even lose to him, work together in order to build this world, this time. Kouha says it would be enough if he was just just a part of En's Household, but Leraje says no, and that he isn't fit to be the vessel for a Household. She says that she understood the kind of person Kouha was by looking at the eyes of his men.