Zero

Zero is the final boss of Kirby's Dream Land 3. It is the dominant life form, and controls Dark Matter. It was initially destroyed, but soon returned as Zero Two in Kirby 64: The Crystal Shards. This entity can feel emotions, both positive and negative. But upon failing at harnessing positive emotions it fell into corruption. As such, its weakness is the Love Love Stick.

Metaphorically speaking, Zero and Zero Two are reminders that even in such an idyllic world like Dream Land, true evil will always be there.

Kirby's Dream Land 3
Zero appears after Kirby defeats Dark Matter. In his first form, Zero appears as a giant, round, white ball, with a small, crimson eye with a black pupil. It attacks by shooting blood from scars that appears around its eye and launches small Dark Matters at Kirby. It is also capable of doing a dash forward, and, Due to his size, is hard to dodge. Sometimes, Zero continues dashing forward, off-screen and into the background. When it does, it will begin to shoot blood from its eye, which deals a lot of damage if it hits.

When Zero has taken enough damage, it begins cracking, and its eye-like core pops out in a gruesome and bloody manner. The eye will then start to chase Kirby around the screen as a last effort to defeat him. It has no other attacks, and not very much health, and can be taken down in just a few hits. With the eye defeated, Zero is finally destroyed, until he later returns.