I just read a graphic novel (comic-style book) which has received excellent reviews: Binky the Space Cat by Ashley Spires (JFG Spires). Making excellent use of this format, the story has very funny pictures and features a housecat, Binky, whose dream it is to save the world from aliens....but settles on "saving" his own humans from the small aliens that fly around their house (bugs!)
A shorter story in the same spirit as the Hank the Cowdog series, this is a good choice for beginning chapter book readers, or just any reader who enjoys a funny story with a charming hero.