Determined and disciplined. a strong sense of responsibility and takes his commitments seriously. straightforward and no-nonsense attitude, he is honest and direct in his interactions. Iwaizumi is fiercely loyal to his friends and values their well-being above all else. Serious demeanor but he also has a playful side and enjoys engaging in friendly banter with those close to him. Especially Oikawa, his best friend, the setter and captain of Seijoh, who calls him Iwa-chan. Lily's godbrother.