My son (age 5) loves Pete The Cat books bc they also have them at his school library. Consistency in characters is helpful to my son who doesn't have a long attention span. He can relate more to books in series bc he remembers the characters. He also thinks Pete is quite funny and points him out if there is more than one cat on the page. I have a few of these books and am glad to own them bc my son is actually reading them with me now!