|“||A benevolent creature, 0² rarely presents any trouble in the cloud levels of Shiver Star.”|
|— Description • Kirby 64: The Crystal Shards Official Strategy Guide (Prima)|
0² resembles Zero in appearance, while also possessing angelic traits. It has a bulbous white sphere for a body and a large, dark red eye (as opposed to Zero's blood-red eye), with a black iris and a white pupil in its center (while Zero had a dark red iris with a pinprick black pupil). However, while Zero's body was completely round, the bottom of 0²'s body is slightly flat with a point at the bottom. It also has a pair of segmented wings, a halo, a large bandage at the top, and a tiny spike or tail on its bottom. When the spike is exposed as its weak spot, it extends in length, turns bright green, and gains spines, making it look like a cactus. 0²'s wings have dark red feathers at the end.
As Kirby enters the core of Dark Star, 0² first wears an amiable visage; two black dots resembling beady eyes above its barely open eye, which looks like a wide smile. The dark red feathers of 0²'s wings are also invisible. As Kirby and Ribbon form the Crystal Shard Gun, its "mouth" opens up wide, revealing its trademark dark red eye, its false eyes disappear as the face melds together, the feathers of its wings appear, and the battle initiates.
Rather than taking control of Planet Popstar, Dark Matter invades the equally peaceful home world of the Fairies, Ripple Star. While not seen to be producing Dark Matter forces, 0²'s role as the final boss, as well as the battle's location, suggest that it is the intelligence behind these events.
Since Dark Matter's first priority on Ripple Star is the destruction of the Crystal in Ripple Star's palace, it is apparent that Dark Matter and/or 0² knows the Crystal presents at least a credible threat to the plans in motion. It is seen near the end of the game that the reunited Crystal has the capability to purge Dark Matter or related forces from the infected people (the Fairy Queen in this case) with a beam of light and relieve them of its possession without the victim receiving a thorough beating beforehand. Comparatively speaking, the Crystal (and its Ribbon's Crystal Gun derivative) is to 0² as the Love-Love Stick is to Zero. Playing into the fairly clear light and dark themes the game presents, it suggests Zero, 0² and Dark Matter are weak against light from the Crystal at least, as well as certain positive emotions as suggested by the effects of the Love-Love Stick against Zero previously in Kirby's Dream Land 3.
0² isn't encountered until the very end of the game, and only if all 74 Crystal Shards are collected. Unless every shard in the game is collected, Miracle Matter serves as the "final boss." In the bad ending, the existence of another evil force is only hinted when the Fairy Queen suddenly smirks in villainous triumph towards Ribbon as Kirby and friends fly away. However, if all the shards are collected, the fully reformed Crystal blasts the Fairy Queen with a beam of light, knocking her unconscious and revealing that she was being possessed by a massive concentration of Dark Matter, and presumably 0² itself.
Kirby has Ribbon's Crystal Gun during the fight, and Ribbon uses her wings to guide Kirby around. At first, 0² is impervious to absolutely any attack, and fires exploding energy balls at Kirby with decent accuracy. However, 0² can be stunned by continuously shooting at its eye; while it is stunned, Kirby must fly up and aim for the halo. The halo changes color each time it is hit. After enough damage is done to the halo, it disappears (and reappears after a short period of time), revealing its bandage, which only requires one hit. After shooting the bandage, 0² flips over, revealing a long, green, thorn-like tail on its bottom. This is its weak spot, so Kirby has to shoot it as many times as he can before 0² flips back over and the whole cycle repeats; however, this is complicated by the harmful green gas clouds the weak spot generates. It is also possible to damage 0²'s wings while it is stunned, which will result in it moving much more slowly and make it lose the ability to follow Kirby: if this is done, Kirby can simply move up and attack the halo without bothering to stun 0² first.
After blasting 0²'s tail with a sufficient number of Crystal Shards from the Crystal Gun, the villain explodes, destroying it along with Dark Star and its inhabitants.
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|Theme - 0²|
- Although their connection is stated to be unclear, 0² is commonly presumed to be revived form of Zero, due to the bandage on its head and appearance that resembles a fallen angel.
- During this fight, on the pause menu, the "Try Again" option is replaced with "Tough It Out!". Selecting this option has the same effect as "Continue." No matter what option the player chooses, once the true final battle starts, there is no other way out except to defeat 0².
- A remix of 0²'s theme can be unlocked in Super Smash Bros. Brawl by collecting 5,000 or more coins in Coin Matches. This remix of the theme also returns in Super Smash Bros. for Wii U as a default song on the returning Halberd stage and in Super Smash Bros. Ultimate as a default song playable on any Kirby series stage.
- 0² is one of the few characters in the series who appears to bleed when it is fought, the others are Zero, Dark Meta Knight, Shadow Dedede, and Star Dream Soul OS.
- The Prima strategy guide for Kirby 64: The Crystal Shards is notably flawed; it states that 0² is a peaceful character who appears in Stage 2 of Shiver Star. Dark Star is left out entirely.
- The description seems more fitting of the enemy Mopoo, which appears prominently in the cloudy area in Shiver Star.
- Both, Magolor Soul and Void Termina's core resemble 0² in that they have what appears to be mouth, which is then revealed to also be a giant eyeball.
- Void Termina's angel form also has wings similar to 0².
- Part of 0²'s theme is featured as one of the tracks for Stage 4 of Egg Engines and plays as part of Magolor's theme in Kirby's Return to Dream Land. Part of 0²'s theme was remixed in the theme of Queen Sectonia during her first form in Kirby: Triple Deluxe.
- 0²'s theme mixed with Miracle Matter's theme and Ripple Star’s stage select theme plays when fighting Morpho Knight in Guest Star ???? Star Allies Go! while playing as Adeleine & Ribbon.
- When playing as Adeleine & Ribbon, Dark Meta Knight, or Daroach in Guest Star ???? Star Allies Go! in Version 3.0.0. or in The Ultimate Choice, the animated background of Dark Star's core is visible through a pool on the ground of the arena used for the final boss rush.