Curiously, he originally received no name in the game, but an official Japanese guide book gives him a name that translates to "Waddle Dee (sailor)." In Kirby: Planet Robobot, he was finally given the full name "Sailor Waddle Dee" in his sticker.
Sailor Waddle Dee looks just like any other member of his species, with the only difference being the blue-and-white sailor cap he wears on his head.
Little is known about Sailor Waddle Dee, except that he serves under the command of Meta Knight. Sailor Waddle Dee appears on the battleship Halberd, getting the instructions from Captain Vul to start its engines. Sailor Waddle Dee panics when Kirby comes and invades destroying most of the crew members until fighting the Heavy Lobster.
During a conversation, Sailor Waddle Dee later accidentally reveals that the only way to destroy the Halberd's Reactor is to fool the laser into hitting its crystalline core. The last time he is seen is before Kirby faces Meta Knight. He is very loyal to his superiors, even choosing to stay with them when the ship is going down.
He makes a cameo in the Meta Knightmare Ultra credits, along with Captain Vul, Meta Knight, and Axe Knight in the interior of the Halberd.