One idea could be that Princess Peach discovers a hidden power within herself during the Showtime event that allows her to communicate with the spirits of the Mushroom Kingdom's past rulers. She uses this newfound ability to learn ancient secrets and protect the kingdom from a new, unexpected threat.
Another plot could be that during Princess Peach's Showtime, an evil force tries to steal the energy of her performance to fuel its own dark magic. Peach has to fight back, not only with her physical strength but also with the positive energy and hope she represents. This could lead to a showdown where she has to inspire the people of the Mushroom Kingdom to believe in themselves and their ability to overcome the evil.
Bowser could be the main antagonist as usual. He might be jealous of Princess Peach's newfound popularity during the Showtime and decides to crash the event and kidnap her once again, leading to a rescue mission by Mario and his friends.
One idea could be that Bowser decides to give up his evil ways to win Princess Peach's heart in a more noble way. He starts doing good deeds around the Mushroom Kingdom, like helping to rebuild damaged areas.
One idea could be that Bowser, in an attempt to win Peach's heart in a more unconventional way, decides to start a lemonade business. He makes the most amazing lemonade using magical lemons from his kingdom. Peach is initially skeptical but as she tries the lemonade, she starts to see a different side of Bowser. This could lead to a series of comical and heart - warming interactions between them.
A possible plot for a Mario and Peach lemon fanfiction could be that a strange lemon - colored comet crashes near the Mushroom Kingdom. Mario and Peach investigate and find that the comet is made of a special lemon - like substance that can grant wishes. However, they soon realize that if it falls into the wrong hands, like Bowser's, it could be disastrous. So they embark on a journey to protect the comet. Along the way, they face many obstacles and also learn more about each other's feelings, with the lemon - comet as a symbol of their adventure and the bond between them.
One plot idea could be that Kagome is transported to the world of Princess Princess. She could be mistaken for a new student in the all - male school and have to navigate the strange rules and hierarchies there. Maybe she uses her miko powers to help solve some problems in the school that are related to an ancient curse.
One idea could be exploring the backstory of the psychic powers in more detail. For example, how did the main character first discover her powers? Another could be a time - travel plot where the princess goes back in time to change an event that had a major impact on her kingdom. Maybe she tries to prevent a war or save a loved one from an early death.
One idea could be exploring a different backstory for the princess. Maybe she has a secret power that she's been hiding from everyone. Another could be a story where the main character from Earth forms an unexpected alliance with a group of Martian outcasts in order to rescue the princess.
One idea could be to explore what would happen if Sara Crewe had a secret magical ability that she discovered while in the attic. For example, she could be able to communicate with the mice in a more profound way and they help her find a hidden treasure in the old house.
Another fanfiction could involve Princess Peach getting lost in the Naruto universe. She could end up in Konoha and Naruto and his friends help her find a way back home. Along the way, Peach might learn some ninja ways and Naruto could learn about her diplomatic skills in dealing with different kingdoms.
One idea could be that Mario gets trapped in an alternate dimension where he has to find a way back to the Mushroom Kingdom and to Princess Peach. Meanwhile, Peach has to hold off Bowser's attacks on her own without her usual hero.