Bubbles (Clu Clu Land)

Bubbles, known as Gloopy (グルッピー, Guruppī) in Japan, is a red balloon fish, and the savior of Clu Clu Land. She appeared in the Nintendo game called Clu Clu Land. She has also made various cameo appearances in the Mario franchise.

Super Smash Bros. series
Bubbles made a cameo in Super Smash Bros. Melee as a trophy. An Unira, which is an enemy from Clu Clu Land, is an item in the game Super Smash Bros. Brawl.

WarioWare: Twisted!
Bubbles appeared in WarioWare: Twisted! in one of 9-Volt and 18-Volt's classic NES videogames. The player must rotate the screen in order to make them collect a Coin. If the Coin was missed, the player would lose the microgame.

WarioWare: Smooth Moves
Bubbles appeared in another Clu Clu Land game in WarioWare: Smooth Moves, where they had to clear an obstacle course of Sea Urchins and black holes.

WarioWare: D.I.Y. Showcase
Clu Clu Land is one of the 18-Volt's microgames set in WarioWare: D.I.Y. Showcase. The game involves Bubbles and some Uniras among some pins. Bubbles will be walking through the place and the player must press while pointing a pin near Bubbles. She will grab the pin and change her direction. The player must avoid the Uniras on-screen until the time's up.

DK: King of Swing
Bubbles ended up on Donkey Kong Island during the events of DK: King of Swing. Bubbles was the most well-rounded character in the game, and she had balanced stats of four in both Jump and Attack. To unlock Bubbles, the player must clear Diddy Kong Mode and collect all 24 medals. Bubbles can only be used in Jungle Jam Events.

misc.
There is a Bubbles costume that appears in Super Mario Maker.