He is a battle-loving man with a bald head. He fought and was defeated by Kenpachi Zaraki sometime in the past, though was strong enough to survive the battle. Once Zaraki became captain of the 11th Division, Ikkaku and his friend Yumichika Ayasegawa joined the Soul Reapers so that they could fight and die under Zaraki's command. He shares a number of similarities with his captain such as seeking enjoyment in battles by risking his life. He is reportedly the second strongest man in the division.Though strong enough to take a position as a captain, Ikkaku insists his one mission in life is to die under the command of Zaraki.