Bunny would've blinked dramatically, but gotta keep the :3 face up and whatnot. :3
"I'm not imaginary, you sillyhead! I've been chillin' around here for, like...well, for however long the Test Reality has existed. Just go up to someone and say 'hey, have you met Bunny?' and they'll be like 'awwwwww yeah'." he explained. :3