0²

Zero Two (written O2 or 02) is the final boss in Kirby 64: The Crystal Shards. It appears in a star named Dark Star. It resembles an angel while it isn't one. It has two blood covered wings, a halo and one bleeding eye. Zero Two seems to support the core of the Dark Star.

Trivia

 * In Kirby 64: The Crystal Shards, Zero Two's name is written as O2 which is the formula for diatomic oxygen. In Super Smash Bros. Brawl, the music for Zero Two is titled 02 which is zero squared.