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.
One possible ally could be a powerful mage from a different anime in the crossover. This mage could help Ichigo understand the strange magic or energy in the new world he is stuck in. Also, Uryu might be an ally. His Quincy abilities could complement Ichigo's powers in Mugetsu form as they face new threats together.
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.
The plot could involve Ichigo's unique abilities causing a stir in the Highschool DxD world. Since he has the power of Mugetsu, he could be a target for some groups who want to either use his power or get rid of him. And at the same time, he could befriend some of the characters from DxD and they could learn from each other's powers.
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.
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.
It could be Aizen from Bleach. Imagine if he somehow found a way to cross over into the Fairy Tail world. His devious and powerful nature would make him a formidable antagonist. He could manipulate the dark guilds in the Fairy Tail world to do his bidding and try to gain control over the powerful magic there, all while being a threat to Mugetsu Ichigo who he has his own history with in the Bleach universe.
Well, 'ichigo in fairy tale mugetsu fanfiction' might be about Ichigo in a fairy - tale - like setting within a Mugetsu - related fanfiction. It could involve Ichigo having adventures in a magical world that is influenced by the Mugetsu concept. Maybe he'll encounter strange creatures or gain new powers.
In an 'ichigo crossover lemon fanfiction', perhaps there is a curse that turns Ichigo's world into a lemon - filled landscape. He has to cross over to different dimensions to find the source of the curse. Along the way, he meets various characters who are either affected by the lemon - related changes or are trying to stop it. His sword skills could be combined with lemon - related magic or abilities that he discovers during his travels.
One possible interesting plot could be Ichigo finding himself in a world where he has no identity or recognition. He could start a journey to regain his status while facing challenges from the new world's rules and characters. Maybe he has to form alliances with unlikely characters to survive and prove his worth.
Another plotline could be that Ichigo is transformed into a different form due to the Mugetsu influence in the fairy tale world. He then has to learn to control this new form while also trying to break a curse that has been placed on the fairy tale world. This would involve him interacting with different fairy tale characters, some of whom might be initially distrustful of him, but as he proves himself, they become his allies.