Bubbles (Clu Clu Land)

Bubbles, also known as Gloopy (グルッピー, Guruppī), 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 makes 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 games Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS / Wii U and Super Smash Bros. Ultimate.

Bubbles appears as a spirit in Super Smash Bros. Ultimate.

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

WarioWare: Smooth Moves
Bubbles appears in another Clu Clu Land game in WarioWare: Smooth Moves, where they must 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 is walking through the place and the player must press while pointing a pin near Bubbles. She grabs the pin and change her direction. The player must avoid the on-screen Uniras until the time's up.

DK: King of Swing
Bubbles ends up on Donkey Kong Island during the events of DK: King of Swing. Bubbles is the most well-rounded character in the game, and she has 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.

Super Mario Maker
Bubbles appears as an unlockable Mystery Mushroom costume for Costume Mario in Super Mario Maker. The costume was added in version 1.40, and can be unlocked by clearing 100 Mario Challenge on Super Expert setting.

Trivia

 * Bubbles was originally stated to be male in Clu Clu Land's Japanese debut, but her gender was changed upon the game's NES localization.