Assist Trophy

The Assist Trophy is an item in Super Smash Bros. Brawl. It will call forth a random character to assist the player who used the item, similar to the Poké Ball item. This is unique in the fact that, the character released is from an actual Nintendo or 3rd Party series, but can't be playable. So, it introduces characters who couldn't make the cut as playable fighters. Almost all characters that come out of the Assist Trophy are invincible.

Players must be on the ground to summon an Assist Trophy's character. If a player is attacked and sent flying after grabbing the Assist Trophy, but before breaking it open, he or she must land before they can call forth the Assist Trophy's character.

It has been rumored the Rosalina from Super Mario Galaxy and Tails from Sonic the Hedgehog games were going to be Assist Trophies, but were removed due to unknown reasons. However, Tails was replaced by Shadow and then became a background character in Sonic the Hedgehog's stage, Green Hill Zone, along with Knuckles the Echidna and Silver the Hedgehog.