Atsushi Oshiro, the Ultimate Architect,  is the main protagonist of this series. Atsushi has a relaxed demeanor about him, and doesn't let things get to him easily. While he may seem relaxed, this does not mean that he is a slacker. Instead, he thinks problems through calmly and rationally. There are times, when the situation calls for it however, where Atsushi will become much more aggressive than usual, while still using his calm wit. He believes in full transparency, and always showing your true self, above all else.

As the Ultimate Architect, Atsushi spends his time mostly in his apartment that he shares with his sister, drafting blueprints and different designs. He rarely goes to school; only just enough to keep him as an official student. This is so that he can provide for himself and his sister, as they live alone.

Atsushi has a medium-low voice. He should have a younger, yet more mature voice, such as someone who has his wits about him. His first line should have a more relaxed and carefree tone, as if he's going wherever the wind takes him, and the other two lines should be much more serious and determined. If I had to compare his voice to a canon Danganronpa character, it would be closest to Rantaro Amami, but I'd recommend not getting too hooked up on that.