Dellinger is a combatant and an officer of the Donquixote Pirates' Diamante Army, who is a hybrid between a human and a fighting fish fish-man. Dellinger is a very short, slim teenager with shaggy shoulder-length blonde hair and a generally girly appearance. His clothing is simple, consisting of light-colored hoop earrings (white in the anime) on his ears, a white baseball cap with horns coming out of it on his head and a mark on the center of his hat shaped like a dark fighting fish.