From the Super Mario Wiki
Whispy Woods is a tree enemy that normally appears in the Kirby games. However, he makes a short appearance in the Club Nintendo comic "Super Mario: Mario im Wunderland." Whispy Woods is the first creature Mario encounters in Wunderland when he accidentally gets there. He does not serve as an enemy here, though; rather he advises Mario to go to Crab, a wizard who is able to fulfill desires.
Whispy Woods returns in Super Smash Bros. Melee in the background of the Dream Land and Green Greens stages. Like in Super Smash Bros., Whispy Woods will attempt to blow players off the stage. Whispy also gains a new attack in Super Smash Bros. Melee; he can shake himself violently and fling apples at characters. Also, a trophy of Whispy Woods can also be obtained in Super Smash Bros. Melee. Whispy Woods returns in Super Smash Bros. Brawl in the Green Greens stage.