This book is a great introduction to the style of a comic book. It's not a comic book, but there are elements that make it similar. There are very few words, and you have to really look at the illustrations to figure out what it going on, but it should be easy for kids as young as 3 to follow along. Wordless books, or nearly wordless, in this case, are fantastic for fostering discussion, imagination and early literacy. The Monkey and The Bee is also funny and kids will enjoy it.
I Yam a Donkey by CeCe Bell
Whose Shoe by Eve Bunting
Betty Goes Bananas by Steve Antony