The Word: Ninjala customisation option is one of the Stickers that your Ninjala character can use as a communication option. To use the Sticker, press up on the d-pad and select it from the communications wheel.
To adjust which Stickers you have available in battle, you can change the communications wheel selected by going into the Closet and then the Communications menu.
‘Word: Ninjala’ Official Description
“NINJALA sticker. Let the aggressive lettering show that you mean business.”
‘Word: Ninjala’ Appearance
The Word: Ninjala Sticker takes the form of a very colourful, street-art-like display of the game’s name.