Speech Bubble is a customizable feature in StreetPass Mii Plaza, which is used in your greeting when introducing g yourself in other people's plazaCustomizable speech Bubbles were introduced in version 2.0, when previously everyone used the same default one. There are now multiple types for the player to choose from, with most of them being unlocked by Plaza Tickets. Below is all of the speech bubbles in the game, as of the newest version.
|The default speech bubble. Looks like a normal speech bubble.
|Create a greeting in StreetPass Mii Plaza