I³ is a type of enemy appearing in Kirby 64: The Crystal Shards. They are cube shaped, with one eye. They are invincible and repeatedly move up and down, attempting to land on Kirby and do him harm. While it will hurt Kirby if it hits him, it cannot crush him.
It is a green box with rounded edges and a single, large eye on its front side.
- In behavior, I³s resemble the Thwomp enemies from the Mario series.
- Their behavior is also similar to an enemy called a Thudd, which also resembles a Thwomp.
- I³ somewhat resembles Dark Matter because of its single eye, but the two have no real connection.