A Sticker is an unlockable collectible exclusive to Super Smash Bros. Brawl. Stickers can be collected in the same way that Trophies can, and can be customized and used to decorate a Sticker Album, but they can also be applied to characters in Adventure Mode: The Subspace Emissary to boost their stats. There are 700 unique Stickers in Brawl.
The Spirits in Super Smash Bros. Ultimate are similar.
In gameplay, Stickers are a far more common collectible than Trophies. They can be unlocked by picking them up when they randomly appear in regular Brawls (if items are enabled), by viewing online matches in Spectator Mode (prior to the shut down of WiiConnect24), in The Subspace Emissary, when dropped by certain defeated smaller enemies or bosses (increased by using the "Sticker Drop" benefit with some Stickers), in Coin Launcher, or when Jirachi is released from a Poké Ball.
Use in The Subspace EmissaryEdit
As stated, Stickers can be applied to characters in The Subspace Emissary to increase their statistics. To use Stickers, they must be placed on the bottom of a character's Trophy Stand. Some Sticker benefits are character specific, although most Stickers can be used by any character. Larger stickers will give higher stat increases at the cost of extra space on the Trophy Stand. The statistical boosts do not apply to other modes, such as Classic or All-Star Mode. Stickers that have been applied to a Trophy Stand can be moved around, but removing a Sticker will discard it permanently. However, they can be regained indefinitely through playing. Stickers cannot be stacked for an increased bonus, and are lost when characters are defeated in The Subspace Emissary.
List of Metroid StickersEdit
There are 29 Metroid-related Stickers. They borrow artwork from several games in the series, although notably, the Gravity Suit's Sticker includes art that is not known to exist anywhere else except a header on the Metroid Zero Mission Official Site.