Ninomiya is the No. 1 Shooter, No. 2 overall combatant, and the leader of the B-Rank #1 Squad, Ninomiya Squad. Ninomiya comes across as a harsh person, being extremely blunt towards everyone even towards his former teammate. He is highly perceptive in combat and also has a bit of a competitive streak. Despite his apparent arrogance, though, Ninomiya is not above politely asking those he considers inferior for help. He is highly skilled in shooting and fighting in general, as is testified by him being the No. 1 Shooter and No. 2 overall combatant in Border, as well as the captain of the B-rank #1 (formerly A-rank) unit. His proficiency extends to strategy as well, making him a capable leader. He tends to fight on his own in rank battles, generally relying on his teammates for defense only to create composite bullets in the midst of combat, as his individual power is great enough to crush most opponents. Ninomiya has an exceptionally high amount of trion, only beaten by Chika's ridiculously high levels.