Ikkaku is a bald man, and is in fact made fun of by a lot of people, especially 11th Division Lieutenant Yachiru Kusajishi, who calls him either "cue ball", "chrome dome", or "pachinko-head" (as a result of her fondness for giving people nicknames or when he questions her direction skills). He often insists that he's not bald and his head is "shaven" while it is obvious that it isn't. As a result of the constant ridicule he gets, Ikkaku is very self-conscious about his baldness to the point where he will threaten anyone that points it out.
