Perhaps the little girl is a huge fan of Jason Wayne. She writes him a letter about her difficult life. Touched by her story, Jason decides to meet her. As they interact, he realizes she has no one to care for her. So, he goes through the adoption process. After that, they have adventures together, with Jason teaching her how to be strong and brave, just like him.
One possible plot could be that Jason Wayne, a lonely hero, meets the little girl at an event. He sees her in a difficult situation, like being bullied or orphaned. This sparks his protective instinct and he decides to adopt her. Then, he has to adjust his life to take care of a child, which includes learning about parenting and dealing with the girl's emotional needs.
In this fanfiction, Sanya Claus could be on a mission to find a successor. He stumbles upon the little girl who has an unwavering belief in the magic of Christmas. Even though she is poor and has faced hardships, she always tries to spread cheer. Sanya Claus decides to adopt her and train her to be like him. As she grows, she faces challenges like learning how to use magic to deliver presents and dealing with naughty children. But with Sanya Claus's guidance, she overcomes these and eventually becomes a great helper, and maybe one day, the new Sanya Claus.
Legal issues could be a major challenge. The adoption process can be complex, especially if there are issues with the girl's background or if Jason Wayne has any 'questionable' aspects in his own life according to the law. He may also face challenges within his own social circle. Some of his friends or colleagues might not be supportive of his decision, thinking it will interfere with his work or change his image. This could put a strain on his relationships as he tries to do what he believes is right for the little girl.
Perhaps the couple themselves have had difficult pasts. The man was once an orphan and the woman had a rough childhood. When they see the abused baby girl, they see themselves in her. They adopt her and then the story could focus on how they use their own experiences to help the girl. They introduce her to a world full of love and kindness, and as she grows, she becomes a symbol of hope for other abused children in their community.
In this fanfiction, the plot might revolve around the little girl having some secrets or a special ability. Bones adopts her not knowing this at first. As they live together, the girl's secrets start to surface. This causes some tension but also draws them closer as they work through it together. Also, Bones' friends might be skeptical about the adoption at first but then come to love the girl.
Well, it could start with the little girl being an orphan from a destroyed village. Naruto, having experienced similar pain, feels a strong connection. He adopts her and as she grows up, she becomes a source of pride for Naruto. She might also have some unique abilities that Naruto helps her develop while also protecting her from those who might want to use her powers for bad.
One interesting plot idea could be that Jason returns from the dead with a new perspective on Bruce Wayne's methods. He could initially be angry and want to prove Bruce wrong, but as the story progresses, they start to understand each other better. Maybe they team up to take on a new and powerful villain in Gotham that neither could face alone.
In this fanfiction, perhaps Danny Phantom's identity gets exposed in his hometown in a way that makes it unsafe for him. Bruce Wayne, who is always on the lookout for those in need, decides to adopt Danny. Danny brings his unique perspective and powers into Bruce's world. He might start training with Bruce and the Bat - family, all while trying to keep his ghost - related problems from spilling over into Gotham's normal world.
In this fanfiction, Bruce might see a lot of himself in Harry. Harry has endured great loss at a young age, just like Bruce. So, Bruce Wayne adopts Harry Potter. Harry could then grow up with access to both the wizarding world and Batman's resources. He could use his invisibility cloak in new and creative ways to help Batman fight crime in Gotham. And perhaps he'd introduce some magical elements to the Batcave.
In the fanfiction, Batman might adopt the little girl because she shows extraordinary intelligence or a unique ability. For example, she could be a tech prodigy. This would attract Batman as he always looks for ways to enhance his crime - fighting capabilities. He would then have to balance his role as a father figure with his duties as Batman, which could lead to some interesting internal and external conflicts.
One possible plot could be that they run away from the chaos of Gotham. Maybe they're tired of the constant fighting and the shadow of Batman. They might start a journey to find a new place where they can define themselves outside of the Bat - family drama. Along the way, they could face various challenges that test their relationship, like dealing with criminals who are after them because of their connection to Batman.