Anya is often very popular in Spy Family fanfiction. Her cute and innocent appearance combined with her powerful telepathy makes for interesting storylines. Loid is also popular as his spy skills and his struggle to maintain his cover while being a part of a family are great plot points. Yor is popular too, especially when it comes to exploring her assassin side and how she tries to fit into a normal family life.
Lincoln is often a very popular character. He is the only boy in a large family, and his leadership skills and quick thinking make him a natural protagonist in spy - themed fanfictions. He can easily be imagined as leading his sisters on various spy missions.
Ruby is often popular. Her family situation, with her mother being absent and her relationship with her sister Yang, provides a lot of material for fanfiction writers to explore family themes.
Harry Potter himself is extremely popular. Writers often explore different aspects of his character, like his life after the war or his relationship with his parents if they were still alive. Another popular character is James Potter. His time as a student at Hogwarts and his friendship with Sirius, Remus, and Peter are often the focus.
Batman is obviously one of the most popular. He's the central figure of the Bat family, and his complex personality and backstory are ripe for exploration in fanfiction. Robin, especially the different incarnations like Dick Grayson, is also very popular. His growth from a young sidekick to an independent hero is a common theme. And Batgirl, with her unique skills and backstory, often features prominently in many fanfictions.
Well, any of the main characters really. But in addition to the ones mentioned, there could be a minor character that gets reborn. For example, one of Anya's classmates. A reborn classmate could have a different personality or set of skills. They could befriend Anya in a new way or cause some interesting plot developments. Maybe they have a hidden talent for hacking or something that gets revealed after being reborn and that could impact the overall story in the Spy x Family world.
Obviously Ginny and Harry themselves are very popular. Their kids, like James, Albus, and Lily, also often take center stage. Then there are the Weasley family members who are still around, like Ron and Hermione who are close friends of the family. Neville could also make an appearance as an old Hogwarts friend.
Batman himself is obviously a very popular choice. His brooding nature and complex backstory make him a great character to explore. Robin, especially the different versions like Dick Grayson, Jason Todd, and Tim Drake, are also popular. They bring youth and different perspectives to the Bat - family.
Definitely Tony Stark. His complex personality, his wealth, and his role as a sort of father figure in some scenarios make him a great focus. He can be shown as mentoring the younger Avengers or having heart - to - heart talks with them about responsibility.
Naruto and Hinata are obvious choices as they are central to the family. Their relationship and how they raise their children are always interesting to explore.
Another character that can be popular is Neville. He could be a teacher at Hogwarts when Harry and Ginny's children go there. His interactions with the kids, his teaching style, and his relationship with Harry and Ginny as old friends can all be interesting elements in the fanfiction. There might also be new characters created specifically for the fanfiction, like a mysterious neighbor or a new wizarding family that has some connection to Harry and Ginny's family.