|Height||178 cm (5'10")|
|Weight||64 kg (141 lbs)|
|Base of Operations||The Osakura family estate|
Aoto is a tall, lean fifteen-year-old boy with slightly tousled sideswept silver hair, a slight Roman nose, and blue eyes. While attending school he wears the black and red gakuran. Outside of school, he often wears a button-up and dress pants, indicative of his affluent upbringing.
Aoto is intelligent, loyal, ambitious, and idealistic. Once he sets his mind to a goal, nothing can dissuade him, as noted by Fuyuki and his own father. He has a slight "ideas above people" mentality, but this is because he is actually quite altruistic, believing in the good of the many and the sacrifices that might be necessary to achieve it.
He is extremely ambitious, perfectionist, and critical, something he says he picked up from his father. His keen and calculating mind make him an excellent tactician; however, when he loses his calm, he can let his feelings and hotheadedness get in the way, which Hiryuu chastises.
Because of long years of parental neglect, Aoto can be slightly attention-seeking, willing to do anything to get his father's approval. Usually this results in him getting stellar grades, but Aoto is also willing to get into trouble if it gets his father's attention. He gets defensive when his insecurities are revealed.
- Fuyuki Hibari - Aoto has a tense friendship/rivalry with Fuyuki. They had a rough start but eventually become best friends, although they remain competitive.
- Hiryuu Osakura - Aoto has a very distant relationship with his father; however, he is extremely dependent on his father, which frustrates him.
- Otfried Augustin von Amsel -
Aoto is of German, English, and Japanese ancestry. He is descended from the von Amsel clan. He spent much of his childhood in Germany, living in his grandfather's mansion.
At some point in the recent past, Aoto lived and studied in Great Britain for a number of years, before settling into Ibaraki.