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, Batman is a given. However, Damian Wayne is quite popular in bat family fanfiction too. His upbringing in the League of Assassins and his struggle to fit into the Bat family's moral code make for some intense and engaging stories. Nightwing is also beloved, with his acrobatic skills and his leadership within the family often being explored in various fan - created stories.
Batman is definitely a popular choice. His detective skills would be very useful in dealing with supernatural mysteries. He could use his knowledge of Gotham's history and its hidden secrets to figure out what's going on when faced with supernatural threats.
Dick Grayson (Robin/Nightwing) is extremely popular. He has a long history in the Bat Family and his acrobatic skills and leadership qualities make him a great character to write about. He also has a complex relationship with Batman, which can be explored in fanfiction.
Batman is definitely one of the most popular. He's the central figure of the bat family, so it's natural that he features prominently. Dick Grayson, as both Robin and Nightwing, is also very popular. His acrobatic skills and complex relationship with Batman make for great story material. Batgirl, whether it's Barbara Gordon or Cassandra Cain, is also a fan favorite. Her intelligence and combat abilities add a lot to the crossovers.
In many fanfictions, there's a Bat Pony leader character. This character is usually strong and wise, guiding the Bat Pony community. For example, a character like Shadowwing. Also, there are Bat Pony characters who are hybrids, part Bat Pony and part other magical creature. They tend to be popular as they have unique abilities and backstories. They can be both a source of intrigue and a bridge between the Bat Pony world and the rest of Equestria.
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.
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.
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.
Obviously, Commissioner Gordon and the Bat family members. The Bat family includes Batman, Robin, and probably Batgirl.
Definitely Robin. He's a bridge between the two groups already. He has his own experience in Young Justice and is also an important part of the Bat Family. His character development could be really interesting as he tries to balance the two worlds.
The main characters are bound to be the core members of the Bat family. Batman is a given as he's the leader. The various Robins are important as they represent different generations and aspects of the family. For instance, Dick Grayson brings his acrobatic skills and his experience as the first Robin. Jason Todd with his more edgy and complex personality. Tim Drake with his detective skills. And Damian Wayne as the son of Batman. Batgirl, with her own set of skills and her connection to the Bat family, would also be a main character. Alfred, who has been with the family for a long time, is also likely to be there as they witness the future.