Perpetually sullen, arrogant, and undeniably short-tempered, Kageyama originally came off as a typical overbearing perfectionist, caring only about winning and completely disregarding the opinions and well-being of his teammates. His habit of complaining about their performance and barking orders at them eventually led the other players in Kitagawa Daiichi to nickname him the "King of the Court", a constant reminder of the oppressive, egocentric attitude he demonstrated during his volleyball.