Another plot could revolve around Mugetsu Ichigo losing his memory of his past self. As he tries to figure out who he is, he discovers his latent powers bit by bit. Along the way, he forms new relationships and makes new enemies. This would be a great opportunity to explore his character in a different light, as he is forced to rely on instincts rather than his past experiences.
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 that Mugetsu Ichigo finds himself in an alternate universe where he has to team up with his other - self from that universe to defeat a powerful new enemy. Maybe this enemy has the ability to nullify his Zanpakuto powers, forcing him to rely on new and creative combat strategies.
One idea could be that Mugetsu Ichigo somehow ends up at the High School DxD school and has to deal with the different factions there. He might use his unique powers to solve some of the school's problems.
One interesting mugetsu ichigo fanfic could be about his journey to regain his full powers in a unique way. Maybe he meets a new ally who helps him understand his mugetsu form better.
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.
Well, perhaps in this fanfiction, Ichigo in Mugetsu form is stuck in a dimension where time and space work differently. He could start losing control of his Mugetsu powers and has to learn to master them again in this new environment. Along the way, he meets a character who has knowledge about his situation and helps him on his journey, which involves facing various challenges and foes.
A powerful rogue Shinigami who has turned against Soul Society and is seeking to use Mugetsu Ichigo's power for his own evil purposes. This antagonist could have some dark secrets related to Ichigo's past or his family, which would add more depth to the story.
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.
A plot could involve Mugetsu Ichigo losing his memories after a battle and ending up in the Fairy Tail world. He starts to learn about Fairy Tail magic and even develops some new skills by combining his existing powers with the magic there. Meanwhile, Fairy Tail wizards are trying to figure out who he is. When a powerful enemy emerges that is related to the Soul Reaper world, Ichigo's latent memories start to return, and he and the Fairy Tail gang must work together to defeat it.
One idea could be Ichigo getting transported to a different dimension where he meets various female characters from different anime. They all fall for his unique powers and his sense of justice. For example, he could meet a magical girl who is intrigued by his sword skills and a strong - willed ninja girl who admires his courage.
Maybe in a Fullbring Ichigo crossover fanfiction, Ichigo's Fullbring could somehow get mixed up with a magical artifact from another fictional realm. This causes him to gain new and unpredictable powers. He then has to journey through different dimensions to find a way to control these powers while also being chased by powerful enemies who want the artifact for themselves.