Sphere Doomer

Sphere Doomers are a special type of Doomer, beings native to Another Dimension that debuted as mid-bosses in Kirby's Return to Dream Land. Unlike others Doomers, they feeds on Energy Spheres, which makes them have an antagonistic behavior toward Kirby since he and his friends are trying to take them away from the Sphere Doomers to fix up the Lor Starcutter.

Kirby's Return to Dreamland
Sphere Doomers are only found on the other side of the dimensional rifts leading toward Another Dimension that randomly appear in Kirby's dimension. They appear in four different varieties in this game. The regular Sphere Doomers are purple, have only two tail feathers and serves as the template for every other Sphere doomers gameplay wise. The fire Sphere Doomers are red, have three tail feathers and use fire based attacks. The spark Sphere Doomers are green, have four tail feathers, and can summon bolts of electricity. Ice Sphere Doomers are white, have five tail feathers, and can create ice storms.

Kirby: Planet Robobot
In Kirby: Planet Robobot, it is revealed that Susie was able to study the regular and fire Sphere Doomers when she was sent to Another Dimension by Star Dream, which allowed to enter their data in the Holo Defense API, which is able to use them as a defense mechanism. The only way to distinguish which Sphere Doomer is which is by their attacks and number of tail feathers, as they share the same color scheme in their normal and 2.0 forms.