Unira

A Unira is an item in Super Smash Bros. Brawl, coming from the game Clu Clu Land. It is a type of Sea Urchin encountered in the said game, acting as an enemy. In Super Smash Bros. Brawl, the Unira can be picked up and tossed at opposing players. When it draws close to an opponent, the spikes on it launch out, causing an increased amount of damage when it hits. It can be used again after being thrown, just like the Mr. Saturn, but it doesn't move around. The Unira doesn't do very much else besides this.

Trophy Information from Super Smash Bros. Brawl
''In Clu Clu Land, the Unira hid gold ingots in an underwater maze, then tried to stop Bubbles from getting them. In Super Smash Bros. Brawl, you can attack an Unira to send it bouncing away. Any fighter it hits will go sprawling. If it hits a wall, it'll bounce back, and if you hit it with a powerful attack, it will transfer the attack to whomever it hits and launch them.''