I'm a Dark Matter.
Fragment of Zero, the embodiment of Void, and source of all existence. He also hates existence, as it's created by tearing parts of him away.
In the Kirby universe, there is a God. He cares about your existence, and want you utterly annihilated as his absolute hatred is beyond any form of mortal understanding.
I can shapeshift, forcefully fuse with/consume people to gain their abilities and turn them into body horrors (It's actually on par with Kirby's ability to gain powers from opponents, Kirby primarily has Skill on them), fire off Dark Matter Lightning, and fly at speeds that can hit FTL speeds in space.
Basically I'm the Angel of a legitimately Evil One True God.
Thankfully, I'm not an asshole.
I'll probably test to see if I can fuse more symbiotically in the future, it'd be a massive display of trust to do so but interesting none the less.