Yuki Makoto

A teen who wields the power of Persona, a Fool who holds the Universe in his hands. And has an ambiguous name.

The Messiah
Door-Kun 's life had been pretty fucked up right from the childhood, his parents dying in a car crash, and the essence of death itself stuffed into his noggin by his future wife. This turned Door into an emotionless, distant and aloof teen. The role model of every emo.

A year in Gekkoukan High School turned out to be a war against Shadows for the future of all that is mankind. As time progressed, social links were formed, Personas were made, Aigis was fucked and Tartarus, the tower that has conveniently been growing right out of the school, was ascended, so grew Door-Kun. And when the final fight against Nyx, the personification of Death, had reached its climax, the blue-haired teen acquired the power of the Universe. Thus, he sealed Nyx, and used himself as a lock, to prevent the destruction of all mankind.

Season 3
Somehow, Door-Kun appeared in TFR. Just what purpose does he have here? What for the Messiah is needed?

It is believed Door-Kun came to seal Demi-Fiend for some reason, maybe he saw his powers a a threat?

Door-kun then proceeded to seal himself just as planned, sending Nyx into SETHIG.