Subaki was born into a family belonging to the upper echelons of Hoshido, one that is renowned for having served the royal family for generations. Following the footsteps of his ancestors, Subaki is thus instated as one of Princess Sakura's personal retainers. Subaki is a self-professed perfectionist, a fact that primarily stems from the legacy of his family's traditions, ones that have conditioned him to strive towards achieving perfection in all that he does. As a result of this, Subaki is known to be very demanding and even unforgiving towards himself as he works tirelessly to meet the harsh expectations that he sets for himself. This has in turn caused him to have the tendency to engage in self-reproach whenever he commits "offences" that he feels make him appear weak and imperfect in the eyes of others. During such occurrences, Subaki is known to lapse into a state of flustered distress as he attempts to rectify his shortcomings. In spite of the excessive nature of his hardworking spirit, Subaki never draws attention to himself, choosing instead to hide his efforts from the notice of others. As a result of the attitude and behavior that he adopts towards others, Subaki can come across as being more obnoxious and arrogant than he actually is. He has the cleanest hands in the army.