Well, in addition to the obvious ones like his friends and family, there could be some minor characters that become important. For example, the shopkeeper Urahara might have some special items or knowledge that could be crucial for Ichigo's recovery. Also, the Visoreds could get involved. They have their own unique powers and experiences. Hiyori might be especially concerned as she has a bit of a connection with Ichigo. They could offer different perspectives on his sickness and how to deal with it.
His friends are very important. Rukia, for sure. She has a lot of knowledge about the spiritual world and could be the one to figure out what's wrong with Ichigo. Orihime with her healing powers also plays a big role. She might use her abilities to ease his pain or at least keep his condition from getting worse. Uryu could also be important as he might use his Quincy skills to analyze what's causing Ichigo's sickness.
Definitely Ichigo's family. His sisters, Karin and Yuzu, would be worried sick about him. They could be the ones to notice his symptoms first and try to take care of him in a more domestic way. His father, Isshin, might also have some secrets or knowledge that could help Ichigo get better. And of course, Ichigo's friends from the Soul Society like Renji and Byakuya might come to check on him and offer their assistance if they think it's something related to the spiritual realm.
Obviously, his brothers are very important. Donatello would be crucial as he could try to diagnose Leo's illness. Raph would be there to provide protection and strength if any threats come while Leo is vulnerable. Mikey would be the emotional support, trying to keep Leo's spirits up.
Obviously Naruto and Kyuubi are the main ones. Naruto, as the protagonist of the original series, is the key character who drives the story forward. His character growth and his relationship with Kyuubi are important aspects.
Hermione would definitely be an important character. She could use her vast knowledge to help Harry throughout the pregnancy, whether it's with medical advice or just emotional support. Another one could be Dumbledore. He might offer his wisdom and protection, guiding Harry through this unusual situation. And of course, the Weasley family, especially Molly. She could be like a mother figure to Harry during this time, making sure he's eating well and taking care of himself.
Videl would be an important character. Since she has been trying to figure out who Saiyaman is, her reaction when Gohan is revealed would be crucial. Also, Goku. Even though he might not be around all the time, his influence on Gohan and his possible reaction to Gohan's double life as a superhero could be interesting. And of course, Chi - Chi. As Gohan's mother, she would have a lot to say about her son being Saiyaman and how it affects his studies and safety.
Hermione would surely play an important role. She could help Harry figure out the details of his inheritance, like deciphering old documents or researching the history behind it.
If it's in a work - related setting, his boss or colleagues could be significant characters. His boss might be understanding and give him time off to recover, or his colleagues could be worried about how his absence will affect the work, which could create some interesting plot points.
Well, Naruto is the key figure in these fanfictions. But characters like Tsunade can't be ignored. As the Hokage, she may give Naruto special tasks or resources that aid in his rise. Rock Lee is also common. His dedication to training and his unique fighting style can inspire Naruto. And Neji, before his death in the original series, could be a character who, in fanfiction, has a change of heart and helps Naruto understand more about the Hyuga clan's secrets, which in turn helps Naruto gain more power and influence.
Naruto himself is obviously a central character. His growth and decisions will shape the story. Hinata could also be important as her relationship with Naruto might develop further. Shikamaru, being one of Naruto's smartest friends, could play a crucial role in planning for Konoha's future and strategizing against potential threats.
Hermione would definitely be important. She could use her extensive knowledge to help Harry understand his creature inheritance. For example, she might research ancient texts to find out more about the origin of his inherited traits.
Obviously Naruto himself is the central character. His growth and new abilities would be the focus. Sasuke could also be important. He might have his own development and his relationship with Naruto could be explored further, whether they are friends or rivals again.