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.
In crossovers with other shonen series, characters like Luffy from One Piece can be paired with Ichigo. Their different personalities and power sets would create interesting dynamics. Luffy's carefree nature contrasted with Ichigo's more brooding side could lead to some humorous and action - packed adventures.
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.
Ichigo could also be paired with Light Yagami from 'Death Note'. It would be an interesting clash of ideologies. Ichigo, who fights for justice in his own way, and Light, who has his own warped sense of justice. Their interactions could lead to some really thought - provoking storylines.
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.
One interesting character to crossover with Ichigo is Light Yagami from Death Note. The clash between Ichigo, who is a protector, and Light, who is a morally ambiguous character with the power to kill, would be very engaging. Saitama from One - Punch Man could also be a great choice. Saitama's overpowered nature and Ichigo's journey to become stronger would make for an interesting story. And what about Alucard from Hellsing? His vampire powers and Ichigo's powers related to the afterlife would create a really dark and exciting crossover.
Aizen Sousuke would be an interesting crossover character. Since he's so powerful and manipulative in the Bleach universe, seeing him in a different setting with Ichigo could create some really complex and intense storylines. They could be forced to work together against an even greater evil in a crossover universe.
Obviously, Ichigo and Dark Ichigo are the central characters. Ichigo, with his complex personality and powers, is always a key figure. Dark Ichigo, being his inner Hollow, brings a lot of drama and conflict. The OC also becomes popular depending on how well - written they are. If the OC has unique powers or a really interesting backstory, they can gain a following among fans of the fanfiction.
Rukia is also very popular. Her cool and composed nature, along with her powerful ice - based Zanpakuto abilities, make her stand out. Her backstory, being from the Soul Society and her connection to Ichigo, gives writers a lot to work with in terms of character development and plot.
In the world of Harry Potter, a crossover with Harry could be interesting. Ichigo's immortality would put him in a unique position in the wizarding world. He could bring his combat skills to Hogwarts and perhaps even help in the fight against Voldemort, while also learning about magic and how it differs from his own powers.
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.