It could lead to a significant power boost for Ichigo and change the course of the story in exciting ways.
Ichigo getting Muramasa in fanfic could result in new abilities and challenges. Maybe it would unlock hidden parts of his personality or force him to make difficult choices to protect those he cares about.
If Ichigo got Muramasa, it might cause conflicts within him as he tries to control this new and potentially dangerous power. It could also draw the attention of various enemies and allies alike, complicating the plot.
Muramasa could develop a softer side. Usually seen as a rather cold and mysterious figure, through his interactions with Ichigo, who is full of passion and determination, he might start to show more emotions. He could become more empathetic towards others, especially those who are fighting for a just cause like Ichigo.
Well, he'd probably have a very different fighting style. The Arrancar Zanpakuto might have unique abilities that are more in line with Hollow powers. He could potentially have enhanced speed and strength, and the release form might be something really wild, like a combination of his Shinigami and Hollow forms.
Well, he could bring his unique sword skills. Maybe he'd form an unlikely alliance with Naruto. He might also introduce new concepts of spiritual power to the Naruto universe.
One idea could be that Muramasa and Ichigo are forced to team up against a new and powerful enemy. They start off distrusting each other but as they fight side by side, they come to respect one another's skills.
In the 'ichigo turns into a baby fanfiction', his relationships would change significantly. For example, Rukia might take on a more motherly role towards him. His friends would be very confused at first but then would do their best to keep him safe and figure out how to turn him back. Also, his enemies might see this as an opportunity to finally get rid of him, but his friends would surely not let that happen.
In a fanfiction where Naruto is trained by Ichigo, there would be a lot of changes. Naruto's chakra control could be improved in new ways under Ichigo's training. Since Ichigo is used to dealing with spiritual power, he might help Naruto understand the flow of energy in a different manner. Moreover, Naruto could learn about Ichigo's way of facing powerful foes without hesitation. This could make Naruto even more fearless in combat, and his Rasengan or other jutsu might be enhanced with new elements inspired by Ichigo's powers.
If Naruto fused with Ichigo in fanfiction, it would be amazing. Firstly, their physical abilities would combine. Naruto's enhanced strength and speed from his training, along with Ichigo's superhuman Soul Reaper physique, would make the fused form extremely formidable in battle. Also, their energy sources could merge. Naruto's chakra and Ichigo's reiatsu might form a new type of power that could be used in different ways. It could also lead to a very interesting story arc, with the fused character having to deal with the memories and emotions of both Naruto and Ichigo.
If Ichigo becomes a vampire in fanfiction, he might gain enhanced physical abilities like super strength and speed. His appearance could also change, perhaps with paler skin and redder eyes. His relationship with his friends might be strained as they might fear or be suspicious of his new vampiric nature.
Well, he would likely have a very different set of powers. Naruto is known for his ninja skills and chakra, while Ichigo has Soul Reaper powers. Naruto might struggle at first to adapt to the new spiritual world Ichigo lives in. He'd probably bring his tenacity and never - give - up attitude, which could lead to him quickly mastering some of Ichigo's basic abilities.
If Undyne won, it could lead to a major shift in the story's direction. Maybe she'd become a hero figure and inspire others.