Mikage is a young boy around the age of 15, 5 foot six inches, with a slender build, and weighing 51 kg. Mikage has an oval-shaped face with tanned skin, a long, thin nose, large mouth with thin lips and narrowed, amber-coloured eyes. His hair is blonde, and parted down the left side, kept in a messy fashion. He also has an X shaped scar on his chin.
Mikage wears the Barsburg Military cadet uniform, consisting of a black, or dark blue, thigh-length tunic with long sleeves and a neck guard. He wears black trousers and knee-length back boots and white gloves similar to the other military cadets. His uniform has golden trimming on the shoulders, chest, sleeve cuffs and neck guard and he also wears a gold belt. He also has gold shoulder boards on his right shoulder and a small version of the Barsburg Military insignia over his left shoulder.
Mikage is first seen at the Academy in the same dormitory at Teito, when one of the officers arrives and tells them to wake for assembly. Mikage is excited about the exam and expresses that he wants to be a soldier and protect his family. Much later he takes the Begleiter exam and passes, but his hopes of becoming a soldier are damaged after he helps Teito escape on a Hawkzile after he (Teito) attacks Ayanami and kills the guards that apprehend him.
Mikage has been shown to be extremely kind-hearted, not judging people by their social class and treating everyone as if they were equal. He was also shown to be above violence(a quality not shown in the anime as he engages in multiple fights), as when Teito becomes furious at Shuri and punches him, Mikage restrains Teito and tells him not to fight, and also when he implores Teito not to take revenge against the military.
Mikage helped Teito running out of the military cell.
Mikage is arrested for helping Teito and is interrogated by Ayanami and Hyuuga. It is possible that he may have been beaten during interrogation, as in a flashback Hyuuga is seen punching Mikage. However this may have been just an illusion created to anger Teito because this was seen during the second part of Teito's bishops' exam, and when Mikage returns to the Church there are no bruises or marks on him to support the theory that he was beaten. Yet at the same time, it's also possible that he was healed by a healing Zaiphon before being sent to Teito. The matter is widely left for the fans to speculate.
Mikage was possessed by a Kor, while being controlled by Chief Ayanami. He had only half of his soul within his body which made it impossible for him to return to his original form. The sudden tears that flowed out from his eyes shows how great his love for his friend is.
Mikage (controlled by Ayanami) and Teito's battle.
Mikage's final embrace.
He still managed a smile at the end of his life. Such sad ending.
Mikage becomes reincarnated as a small pink Fyulong, (nicknamed by fans as Burupya (ブルピャ) due to distinctive call the young have) and brought to Teito by Frau who said that the dragon had fallen out of its mother's nest. The reason Mikage chose not to be reincarnated as a human is because he wished to protect Teito, no matter what form.