Nonny's a brainy, cautious, and overly calm Guppy. He's more likely to comment on the action than get swept up in it, often using an advanced vocabulary for his age. Physical activities make Nonny a little unsure of himself--he'd rather define "basketball" than play it. Even so, Nonny has a persevering spirit. His willingness to keep trying, combined with encouragement from his friends, often leads him to triumph in the end.
Nonny has peach-colored skin and green eyes. He wears blue goggles and has orange hair. His tail is green.
Nonny appears in every episode of Bubble Guppies. He first appeared in the "Call a Clambulance!" episode.