Naruto's Rasengan could be infused with the Yuki Onna's ice powers. For example, he could create an Ice - Rasengan that has the destructive power of the Rasengan but also the freezing capabilities of the Yuki Onna's ice. This new jutsu could be used to defeat powerful enemies that are resistant to normal attacks.
One idea could be that Naruto is on a mission in a snowy region and encounters the Yuki Onna. She initially sees him as a threat but as they interact, she realizes he has a pure heart. They could team up to fight a common enemy that is disturbing the peace of her snowy domain.
Kuchisake - Onna has a rather eerie real story. Legend has it that she was once a beautiful noblewoman. But because of her excessive pride in her looks, she was punished in a cruel way. After her transformation into a malevolent spirit, she wanders, especially at night. People in Japanese folklore were very cautious of her, as her presence was seen as a sign of impending doom in some cases.
The 'kuchisake - onna' is a Japanese ghost story. It's about a woman with a slit mouth. Legend has it that she was a beautiful woman who was punished by having her mouth slit from ear to ear. She now wanders, often wearing a mask and asking people if they think she is beautiful. If they answer no, she kills them; if they answer yes, she removes her mask and asks again, and if they show horror at her slit - mouth, she also kills them.
The kuchisake - onna has an origin story rooted in Japanese superstition. Legend has it that she was a vain and proud woman in her past life. Because of her beauty, she was unfaithful to her husband. As a punishment, her mouth was cut horribly. Now as a spirit, she roams, preying on the fear of others. She approaches people and asks if they find her attractive. Depending on the response, she either spares or harms them.
Definitely not. Kuchisake Onna is a fictional creation, part of the rich world of Japanese supernatural tales. These kinds of stories are often used to scare or entertain rather than being factual.
Yes, there are different versions. One version might emphasize the moral aspect more, like her being punished for vanity and infidelity. Another could focus on the tragic accident that led to her disfigurement rather than a punishment. Some stories may also have different details about how she became a spirit, whether it was a sudden transformation or a slow process of her negative emotions building up after her death.
One common theme is the clash of different dueling styles. Since Yugioh and GX have their own unique styles, in crossovers, seeing how they interact is often explored.
I haven't read this novel specifically. But generally, it might explore the relationship between the characters, perhaps with themes of youth, identity, and unique personalities. Maybe the 'end of novel' part implies a conclusion to the story arcs of the denpa onna (a girl with some special or 'radio wave' - like characteristics) and the seishun otoko (youthful boy).
I'm not entirely sure as I haven't specifically played it. But generally, a visual novel often has a story with characters and different plotlines. It might involve themes related to the title, perhaps about female characters ('onna kanbu') in some sort of context, which could be related to a dark or 'aku no' (evil or bad) situation. However, without more information, it's hard to be more precise.