A bird that looks a lot like Kirby. Bronto Burt has clear wings that he uses to busily flutter around the skies of Dream Land. He will pull off sudden dive bombs on occasion, and although he has no ill will toward Kirby, Bronto Burt will sometimes collide with the pink hero if he gets in the way. You should be especially careful of these collisions.
These pink, winged enemies come from the Kirby series. In Smash Run, there are three different types floating around: one that flees when a fighter approaches, one that flies sideways, and one that chases fighters. Their spinning attack is weak, but it can cause knock-back if it lands repeatedly. These pink, winged enemies are all over the place in the Kirby series. In Smash Run, there are three different types of Bronto Burt, including one that relentlessly chases after you. Their spinning attack might not deal much damage, but there's a danger you could get launched if it hits repeatedly, so be careful!
The internal file structure for Super Smash Bros. Brawl suggests that Bronto Burts would have appeared as enemies in The Subspace Emissary, prior to when they were included as enemies in the Smash Run mode of Super Smash Bros. for Nintendo 3DS.