Characters talk to each other in battle with speech bubbles popping up over their heads like they are in the comic book. (the-gamers-lounge.com)
A more sophisticated app would include subtitles that appear under specific people in the form of speech bubbles. (newscientist.com)
This resource contains a handy pocket - sized questioning booklet and large speech bubbles for introducing and ensuring understanding of each question stem. (tes.com)