The Face: Smiling customisation item is one of the Stickers that you can bind to your Ninjala character’s communication wheel – which is accessed by pressing up on the d-pad in battle.
To adjust which Stickers you have available during Ninjala matches, you can change the communications wheel selected by going into the Closet and then the Communications menu.
‘Face: Smiling’ Official Description
“Sticker with a smiling expression. Useful for many occasions. For people you like, or even those you don’t.”
‘Face: Smiling’ Appearance
The Face: Smiling Sticker shows a standard yellow smiley face when you select from the communications wheel in Ninjala.