Zoomer

Zoomer is an enemy introduced in Sonic the Hedgehog 4: Episode II. It is a bird-based Badnik with wings and rockets, making them capable of flight.

Sonic the Hedgehog 4: Episode II
In Sonic the Hedgehog 4: Episode II, Zoomers appear as enemies. They are only encountered in Sylvania Castle Zone. Here, they fly in stationary positions above the local water surfaces. When the playable character is coming towards this Badnik however, it will launch itself downward into a mighty dive until it hits the ground. The player can perform both Spin Jump or Spin Attack to defeat a Zoomer, although running past them fast makes them relatively harmless. Also, upon their destruction, they will reward the player 100 points and release an Animal.

Sonic the Hedgehog (IDW Publishing)
In the Sonic the Hedgehog comic series by IDW Publishing, the Zoomer is a Badnik model created by Dr. Eggman. Their past is virtually identical to their game counterparts', up until after the events of Sonic Forces.

Zoomer would make their first appearance in the IDW comic series in Sonic the Hedgehog: Imposter Syndrome #3, where a singular Zoomer model and a horde of other assorted Badniks would be used by Dr. Starline to test Surge the Tenrec during one of her tests at Starline Base Sigma. Unfortunately, the Zoomer and the other Badniks were easily destroyed by her.

In the Sonic the Hedgehog #51 story, "Escaping the Empire," a Zoomer would be among one of the many Badniks that chased Sonic and his friends.

In the Sonic the Hedgehog #57 story "Urban Warfare, Part 1," More Zoomers aided their fellow Badniks in defending Eggperial City from Sonic, who was now being aided by Tangle, Whisper, and Lanolin on a mission from the Restoration to stop the city's expansion. Notably, one Zoomer was able to break the grasp of Sonic and Tangle, causing the latter and her other two accomplices to fall into the now mobile portal from the Eggman Tower. This moment makes it one of the very few times a regular Badnik was able to defeat the main cast.

Physical appearance
Zoomer Badniks are based on Kingfisher birds, but have a similar appearance to that of Hummingbirds. Design-wise, they have almost egg-shaped bodies with no neck between their heads and torsos. Their torsos in particular are yellow with aqua blue upper chest areas, and they possess red claw-like feet near the bottom of their torsos. They also have a gray rocket exhaust on their bottom, and on their backs are an aqua blue, tailfeather-like flap covering their backs. They also have a pair of wings with adjustable flaps, white edges, and orange tips. Lastly, they have a round head with a pair of cartoonish black eyes, a long and thin gray beak with an orange lower beak, an orange line circling their heads like a brow, and white metal behind their eyes.

Trivia

 * The attack pattern of a Zoomer is likely a reference to the Kingfisher's technique of capturing prey.