The colorful graphics of cartoon characters on most of these pull-up products are there for wetness indication. When the child wets the product, then the colors will fade on the pictures. Parents and kids will know that their pants or underwear are wet enough to be changed then. The cartoon characters also encourage kids in wearing the pull-ups because they like personalities. Anything to get them down this road of transitioning to regular underwear and going to the bathroom on their own is good to use.