Unira

An Unira (, Unira) is an item that appears in Super Smash Bros. Brawl, Super Smash Bros. 4, and Super Smash Bros. Ultimate.

Origin
Uniras made their first appearance in the game Clu Clu Land, where they were officially also known in English as Sea Urchins. They are sea urchins that are stealing treasure from the underwater kingdom Clu Clu Land. They feature as enemies which damage Bubbles on contact; but they can be defeated by sending out sound waves to stun them, and then smashing them into a wall.

Overview
The Unira spawns with its spikes retracted; in this state it is harmless and can be picked up and thrown. Upon touching a surface or an enemy a thrown Unira extends its spikes, either clinging to the hit surface or falling to the ground if it hit an enemy. An active Unira has a slight vacuum effect and deals 10% damage and moderate knockback on contact; this does not affect the thrower. Hitting an inactive Unira with a strong enough attack will also activate it, while weaker hits will just make it slide harmlessly on the ground.

Hitting an active Unira hard enough makes it return to its inactive state; it can then be grabbed and thrown by any character. However, in Smash 4, the Unira is much harder to make it safe to use.

Spirits
In addition to the above, equipping the Pitch, Smoky Progg, or Super Sea Snail support spirits will give the player a Unira at a start of their stock.

Trivia

 * In Brawl custom stages, if a player makes a triangle out of two 45° soft platforms (side by side, making a small triangle) on top of a surface and then a Unira is placed inside, the opponent will begin to shake when above the triangle, even when they are sleeping. This is caused by Unira's vacuum moving the opposing player left, then right, then left, etc.