Naruto has a strong case for being the most powerful. His Nine - Tails chakra mode makes him incredibly strong, fast, and durable. He also has a vast array of ninjutsu at his disposal. In a crossover, he could potentially learn to use Ichigo's reiatsu in some way, making him even more powerful. Plus, his never - give - up attitude could give him an edge in a tough battle against Ichigo.
There are quite a few good ones out there. For example, 'Beyond the Final Form' is a fanfic that not only explores Ichigo's new powers but also the lore behind his final form. It has a complex plot that involves different Soul Society factions reacting to Ichigo's transformation. 'The Final Form's Purpose' is another one where the author tries to give a deeper meaning to Ichigo's final form, like it being a key to a greater mystery in the Bleach universe.
Firstly, a good fanfic should stay true to the Bleach universe's rules and lore. Regarding Ichigo's final form, it should explain how he achieved it in a way that makes sense. It could be related to his Quincy, Hollow, and Shinigami powers. The character development is crucial. Maybe Ichigo has to overcome some self - doubt or fear associated with his new form. Additionally, the writing style matters. A vivid and engaging style can really bring the story of Ichigo's final form to life, making the readers feel like they are right there in the Bleach world, experiencing his transformation and the events that follow.
Luffy from One Piece is also a common pairing. Luffy's carefree and adventurous nature combined with Ichigo's more serious and duty - bound personality would lead to some really fun and unpredictable interactions. They could be on a quest in a crossover world, with Luffy's devil fruit powers and Ichigo's Soul Reaper abilities working together in strange and amazing ways.
One idea could be exploring how Ichigo's hollow form affects his relationships with his friends. Maybe his hollow side makes him more aggressive towards them at first, but they gradually learn to accept and help him control it.
One popular character paired with Ichigo is Naruto. Their different power sets and personalities make for an interesting combination. Naruto's positive and determined attitude could contrast with Ichigo's sometimes brooding nature. Another is Luffy from 'One Piece'. Luffy's carefree and adventurous spirit next to Ichigo's more serious approach to protecting his friends can create some great stories.
Uryu could be another supporter. Despite their differences in the past, Uryu has come to respect Ichigo. In this strange situation, he might use his intelligence to help Ichigo. For example, he could research any possible side - effects or solutions related to the mpreg. Orihime is also a strong candidate. She has feelings for Ichigo and would be very empathetic. She would likely offer her healing powers and motherly - like care to Ichigo during his pregnancy.
Superman would be really interesting. Ichigo, coming from a world of spiritual powers, would be in awe of Superman's physical strength. And Superman would be curious about Ichigo's ability to see and interact with souls. Their different power sets and moral compasses could lead to some great character - building moments. For example, Ichigo might learn about the importance of using power responsibly in a more global sense from Superman.