From the Super Mario Wiki
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In Super Mario Bros. 3, Jugem's Cloud can be used by the player on the world map to skip a level and move to the next available space. However, if they lose a life after using it, they will be transported back to the position on the map they were prior to using it.
In Super Mario World, Super Mario World 2: Yoshi's Island and subsequent side-scrolling platformers in the Super Mario and Yoshi's Island series, after taking out the Lakitu riding it, the player can jump on Lakitu's Cloud to temporarily float around and reach places that they could normally not get to.
In New Super Mario Bros. 2, when the player touches a Gold Ring, Lakitus and their clouds become gold. When the player rides on the cloud and moves, it generates coins. In New Super Mario Bros. U, Lakitu's Cloud now mouths to the "bah"s in the music. It also appears in the Challenge Mode level Lakitu's Cloud Heist.
Lakitus reappear in Super Mario Galaxy 2 riding their clouds, but these clouds cannot be ridden by Mario or Luigi. If a Lakitu's cloud is eaten, the Lakitu will fall to the ground on its shell and struggle for a few seconds until the cloud reappears.
In Mario Kart games, Lakitu's Cloud is frequently seen alongside the recurring Fishin' Lakitu assistant. In Mario Kart 7, the cloud wears goggles in water-themed courses. A kart based on it, Cloud 9, is also introduced in that game. In Mario Kart 8 and Mario Kart 8 Deluxe Lakitu's Cloud appears on several flags around the course Dragon Driftway.
Most Lakitu's Clouds are white. However, in Paper Mario, Lakilulu, the girlfriend of Lakilester, has a pink-colored cloud; additionally, the clouds of Dark Lakitus from Paper Mario: The Thousand-Year Door are gray in color. Lakithunder of New Super Mario Bros. also has a dark gray cloud with glaring, yellow eyes; Lakithunder's cloud is capable of firing lightning bolts as well. King Lakitu from Super Mario Galaxy 2, another lightning-firing Lakitu, has a purple cloud.
Most Lakitu's Clouds have faces. In the Paper Mario series, the clouds share the expressions of their owners; additionally, some Lakitu's Clouds in the Paper Mario series wear sunglasses. The clouds of Fishing Boos and Calm Fishing Boos do not have faces, however, and in Super Mario 64, The Super Mario Bros. Super Show!, and Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen!, all Lakitus are portrayed without faces on their clouds. In the latter, Lakitu and Mario are able to control rain, thunder, sun, typhoons, and snow with levers that are on the cloud.
Some similar cloud characters and items have appeared throughout the Mario franchise. In Super Mario World, when Yoshi eats two pink berries in the same stage, a cloud resembling Lakitu's Cloud appears and drops ten striped smiley-faced coins, giving a 1-Up Mushroom if all are collected. The Thunder Cloud item in Mario Kart Wii looks like a Lakitu's Cloud, albeit bluish-gray and has a Lightning on its head. Ruff Puff's Tattle in Super Paper Mario openly speculates on the relationship between it and the similar Lakitu's Cloud.
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