Nonny is a brainy, cautious, and overly calm male guppy. He's more likely to comment on the action than get swept up in it, and he often uses an advanced vocabulary for his age. Physical activities make Nonny a little unsure of himself, as he'd rather define "basketball" His willingness to keep trying, combined with encouragement from his friends, often leads him to triumph in the end. Nonny loves to read books, and has been seen doing this in several episodes. His nickname is Nonners, although nobody calls him that but Deema.
Nonny has peach skin, carrot orange hair, and green eyes. He wears cerulean blue glasses, which resemble scuba goggles. His tail is light green with dark green stripes. His ears are slightly larger than the other guppies'. He is thinner than them as well. Because of his thin stature, it gives him the illusion of having unusually large hands. But in Zach and Leah's greatest adventures he wore a yellow shirt and a blue skirt.He wore yellow and white leggings.