Unira

Unira (known as Sea Urchins in localized versions of Clu Clu Land) are a type of sea urchin serving as the main antagonists of Clu Clu Land. In the game, they have taken all of Clu Clu Land's gold bars and try to stop the game's protagonist, Bubbles, from getting them back.

The first appearance of Unira in a Mario-related game is in WarioWare: Twisted!, in the microgame Clu Clu Land. They later appear in WarioWare: Smooth Moves, which features another microgame of the same name.

Unira later appear as items in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U, which refers to them under their Japanese name. Unira can be picked up and tossed at opposing players. After being thrown, its spikes pop out damaging all except the one who threw it. When players stand close enough to it, it draws them toward itself. An Unira can change "possession", so to speak, if it is attacked. For example, if a player throws it, the Unira will not harm the player; however, if an opponent attacks the Unira, its properties will change and cause harm to the player while not damaging the opponent.