Fun Bun and Puddles

Fun Bun and Puddles are characters from the 2018 Walt Disney Animation Studios film Ralph Breaks the Internet. They are the bunny and kitten co-stars of Pancake & Milkshake, a video game app where one has to serve the duo specific foods before the clock runs out.

Role in the film
In the film, a Pancake Milkshake package with Fun Bun and Puddles' image is being examined by Wreck-It Ralph for one of his BuzzzTube video; and upon opening it, he is bombarded with bees to tie in with a bee pun.

In a post-credits scene, a toddler is being driven home after seeing the film Ralph Breaks the Internet and bemoans about a scene being cut from it, so her mother suggests she play Pancake Milkshake on her tablet where Fun Bun and Puddles are. The duo is supplied their treats — pancakes for Fun Bun and milkshakes for Puddles — when suddenly, Ralph and Vanellope Von Schweetz enter the diner to the bewilderment of the animals and the player. Amused by the game's mechanics, Ralph opts to play with the objective. Ralph's servings are mild for the duo before Vanellope uncovers a stash of pancakes to serve Fun Bun, bringing dread to him and Puddles. After Ralph gives several consecutive helpings of pancakes, Fun Bun swells to morbid obesity; Vanellope urges Ralph to let Puddles have a treat, but Ralph encourages the overfed rabbit one more plate of pancakes. Fun Bun weakly accepts the serving, though once he gulps down the meal, his body cannot handle the pressure and he begins to rumble. Puddles ducks down for cover while Fun Bun explodes on-screen, traumatizing the toddler.

Disney Parks
The duo, or rather aggressive clones of them, are primary enemies inside the virtual attraction Ralph Breaks VR. Controlled by the antagonistic security system B.E.V., these copies are encountered inside Pancake Milkshake Diner, where they assault Ralph and take him hostage while launching the players with confectionary projectiles.

Trivia

 * A real-life version of their game was released for iMessage for iOS.
 * Their role in the after-credits is a meta-joke to how their scene was in the film's teaser but ultimately cut from the final version that audience members were disappointed of, as the toddler points out.