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.
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.
Sailor Waddle Dee's fate is at first unknown after the Halberd crashes into the Secret Sea, but Kirby Mass Attack reveals that he is alive and well.
Sailor Waddle Dee is the only known Waddle Dee that serves Meta Knight, besides the on-board enemies.
He and Bandana Waddle Dee are the only Waddle Dees shown to speak, unlike the rest of their species. It is unknown if they are the only Waddle Dees that can talk, though Yarn Waddle Dees have also demonstrated the capability to do so. However, they are not true Waddle Dees.