Some kids do care what pictures are on their diapers and others don't care at all.
One of my nephews will not wear a diaper unless it has Mickey Mouse on it and my other Nephew won't wear diapers with any kind of pictures on them.
He'll only wear a diaper if it's plain white with no cartoon characters or prints on them.
So I'm thankful that honest company diapers make plain white diapers otherwise he would be wearing cloth diapers that are plain white.
So while some kids do care about cartoon characters on their diapers some hate the cartoon characters on diapers.
In my opinion I hate that diapers even have cartoon characters on them. When I was a baby in disposable diapers they were plain white with no prints on the diapers.
Most times a diaper is gonna be hidden underneath a child's clothing so no one will even see the cartoon characters or prints on the diapers except for the parents and the child when the child has it's diaper changed.
The reason that diapers even have cartoons on them is marketing plain and simple. It's a way to market those cartoon characters to those young children in diapers and ingrain that cartoon character in the child's head.