He originally received no name in the game, but an official Japanese guide book gives him the name "Waddle Dee (sailor)".[1] In Kirby: Planet Robobot, he was named "Sailor Waddle Dee" in his sticker.
Sailor Waddle Dee 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.
This section contains information that does not coincide with the main series canon.
Sailor Waddle Dee makes a brief appearance in Kirby Mass Attack, appearing alongside Bandana Waddle Dee during the boss battle with Meta Knight in the sub-game Strato Patrol EOS.
Sailor Waddle Dee's fate after the Halberd crashes into the Secret Sea is unknown, as he is never shown escaping, nor was it stated that he did. While he does appear in Strato Patrol EOS in Kirby Mass Attack, this appearance is not canon. However, it may imply that he is still alive.