Waddle Doos are common enemies. Just like Waddle Dees, there is a ball form and a helper in the Kirby Super Star games. Waddle Doos in Kirby 64 are Waddle Dees posessed by Dark Matter. In Kirby's Avalanche, it duels you to stand up for Waddle Dee. Waddle Doos give you the Beam ability.
Super Smash Bros. BrawlEdit
Waddle Doos appear in Super Smash Bros. Brawl. When the King Dedede uses his special + right/left attack, he throw a Waddle Dee or a Waddle Doo. The Waddle Doo will walk a little and then it will use his beam attack.