No. Spanking is a form of physical punishment which is not suitable for promoting in children's literature. And diaper stories in a context that might be related to such inappropriate situations are also not suitable for children. Children's literature should focus on positive values, friendship, kindness, etc.
In general, such stories are not considered appropriate in mainstream anime culture. Anime often aims to promote positive values like friendship, courage, and personal growth. Stories involving humiliation, especially those related to diapers in a demeaning way, go against these positive ideals and can be seen as offensive or inappropriate by many.
The anime 'Usagi Drop' has elements related to taking care of a young child who would be in diapers. It's a story about a single man taking in his young relative and all the challenges that come with raising a child, which includes dealing with diaper - changing and other baby - related tasks. It's a very heartwarming and realistic portrayal.
There are many. For example, stories about a girl's adventure in a magical forest where she meets friendly animals and learns about nature. Or stories of a girl who overcomes difficulties in school by using her intelligence and the help of her friends.
In some cases, it could be a part of a unique world - building concept. If the anime is set in a world where magic or some strange phenomenon can turn people into different forms, a girl turning into a baby - like form with a diaper could be just one aspect of that strange and interesting world. It can add a touch of quirkiness to the overall setting of the anime.
There are not many mainstream animes with such a specific theme. However, some slice - of - life or comedic animes might have a character in a baby - like situation with a diaper for comical effect, but it's not a central 'diaper girl story'. For example, in some episodes of 'Lucky Star', there are some cute and comical baby - like scenarios.
It is relatively uncommon. Usually, in traditional stories, boys are the ones who are more likely to be in a position of power or the ones causing trouble in a more physical way. But when it does happen in a story, it often serves to break gender stereotypes and show that anyone can enforce boundaries when they are crossed, regardless of gender.
Not really. This kind of situation is not very common in most friendships. Physical actions like spanking, even in a friendly way, are not the norm in modern friendships.
Yes, they can be common. Young girls, especially those who are still in the process of potty training, may have accidents. Their bladders are small and they might be too busy playing or in a new situation to notice the need to go to the bathroom in time.
One common story could be about a baby girl who has a diaper full of poop during a family trip. Her parents have to find a suitable place to change her diaper quickly. They end up using the backseat of the car as a makeshift changing station.