You could write a fanfic that focuses on Ichigo's training in a game - like scenario. Maybe he has to complete a series of challenging quests to gain new powers or unlock hidden abilities.
One idea could be to have Ichigo cross over into a different anime universe filled with potential love interests. For example, he could end up in a magical girl anime world where he has to deal with a group of girls who are both intrigued by his power and his different nature. Another could be a crossover into a post - apocalyptic world where a harem of strong - willed women see Ichigo as a symbol of hope and gradually develop feelings for him.
One idea could be to have Ichigo from 'Bleach' cross over into a world of a popular female - led anime like 'Sailor Moon'. He could team up with Sailor Moon to fight a new common enemy that threatens both their worlds. Their different fighting styles and powers would make for an exciting combination.
Maybe in the fanfic, Mugetsu Ichigo teams up with some unexpected characters from another series. For example, he could meet characters who have unique abilities that complement his own, and together they face a powerful common enemy that neither could defeat alone. This would lead to some interesting character interactions and power combinations.
One idea could be Ichigo getting transported to different anime universes where he meets various female characters who are instantly attracted to his unique powers and sense of justice. For example, he could end up in the Naruto universe and meet Hinata, and she might be intrigued by his ability to see spirits. Another could be in the One Piece world, where Nami sees Ichigo as a potential ally against powerful enemies. The harem aspect would develop as these characters start to compete for Ichigo's attention in different ways.
A possible plot is that Hichigo and Ichigo get into an accidental body - swap situation. This would lead to some comical moments as they try to act like each other in their respective lives. Also, a fanfic could explore a scenario where Hichigo has memories of a past life related to Ichigo, and these memories start to resurface, changing their relationship. They might have to deal with the implications of these memories together.
Well, perhaps the fanfic could focus on how their relationship evolves during the pregnancy. Rukia, being a strong Soul Reaper, might initially struggle with the idea of being more vulnerable due to the pregnancy. And Ichigo could be overly protective. They could also face opposition from the Soul Society, which adds a lot of drama to the story.
Maybe fem Ichigo has a different set of powers compared to Ichigo. In the fanfiction, they could train together to combine their powers in a unique way. For example, her powers might be more focused on defense while Ichigo's are on offense, and they learn to complement each other. This could lead to some interesting character development as they overcome their differences and work towards a common goal.
One idea could be to focus on the backstories of the shikigami. For example, you could write about how a particular shikigami came to be in the service of the onmyoji. Another idea is to create an alternate universe where the rules of the game are slightly different, like the shikigami having different powers or relationships. You could also write a fanfic centered around a specific event in the game's lore, expanding on it and adding new details and characters.
One idea could be to create a fanfic that focuses on an alternate ending for the game. Maybe the main character makes a different choice at a crucial moment, leading to a whole new set of adventures and outcomes. Another idea is to write a fanfic that delves deeper into the backstory of a minor character in the game. This can give more depth to the game's world and make the character more interesting.
One idea could be to create a fanfic where Luffy and his crew end up in a parallel universe. In this universe, the Straw Hats have different abilities and they have to figure out how to use them to get back home. Another idea is a time - travel fanfic. Luffy travels back in time and meets Gol D. Roger. He could learn some valuable lessons from Roger and use that knowledge to strengthen his crew.