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.
Potential important characters in the 'Gohan gets revealed as Saiyaman fanfic' include Goten. As Gohan's younger brother, he might look up to Gohan even more when he discovers his Saiyaman identity, or he could accidentally let the secret slip. Android 18 could also be involved. She has a no - nonsense attitude and might be the one to protect Gohan when his identity is revealed and enemies come after him. And then there's Dende, the Namekian. He could use his healing and spiritual powers to help Gohan deal with any physical or emotional turmoil that comes with the revelation of his Saiyaman identity.
The 'Gohan gets revealed as Saiyaman fanfic' could have a plot twist where Gohan is forced to reveal his identity to save someone. Say a villain has captured Videl, the girl he has feelings for, and the only way to rescue her is by showing his true self as Saiyaman. This would not only expose his identity but also his feelings for Videl. Another plot twist could be that Gohan's Saiyaman identity is actually a clone created by an enemy. So when the real Gohan shows up at the same time as Saiyaman, it causes mass confusion. And finally, it could be that Gohan's reveal as Saiyaman leads to a new form of training for him. Since his identity is out in the open, he has to learn to fight without the disguise and in a more public way, which forces him to develop new techniques and powers.
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.
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.
Sakura could have a different relationship with Naruto in this fanfiction. Since Tsunade trained her, there could be more of a family - like bond between Sakura and Naruto. Also, characters like Sasuke would still be relevant. His rivalry with Naruto could be affected by Naruto's new family situation. Additionally, Shizune, Tsunade's assistant, could be involved, perhaps acting as an older sister figure to Naruto.
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.
Obviously, Dawn and the members of Team Rocket like Jessie, James, and Meowth are the main ones. But there could also be Dawn's Pokémon, like Piplup, which might try to rescue her. And there could be other Pokémon trainers or characters from the Pokémon world who might get involved in the rescue mission.
All Might could also be important. He might offer his wisdom and support to Izuku, sharing his experiences as a hero and how she can still be a great hero even during pregnancy. And of course, Izuku's mother would be crucial. She could provide both practical and emotional support, like cooking nutritious meals and giving her advice on motherhood.
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, Gohan as a girl would be the main character. His family members like Goku, Chi - Chi, and Goten would likely be in the story. They would have different reactions and interactions with Gohan in his new form.
Neville could play an interesting role. Maybe he could be the one who discovers a new magical plant that is needed for a potion to cure an illness that Ginny or Harry contracts during their marriage. Luna could also be involved. She might come to them with some strange but useful prophecies that help them in a difficult situation, like dealing with a dark wizard who has a grudge against Harry even after the war is over.