"Dragonbreath" by Ursula Vernon (Dragonbreath, Book 1)

Danny Dragonbreath can't breathe fire, but he has no fear. And that comes in handy when a bad grade at school inspires him to enlist his cousin the sea-serpent's help with a research project. Using a hybrid of comic-book panels and text, Ursula Vernon introduces an irresistible set of characters that will have readers laughing until smoke comes out of their noses!