It's possible that the main characters are from different backgrounds. One might be from a world full of pain and sorrow, and the other from a more positive and loving place. Their meeting and the subsequent relationship is what the fanfiction is centered around, with love gradually taking away the pain of the first character.
Perhaps there are two main characters, one who is a giver of love and the other who is the receiver. The giver could be a very empathetic and kind - hearted person, while the receiver is someone who has been closed off due to their pain. Through their interactions, the love starts to work its magic.
Maybe in the 'love take away the pain book four fanfiction', there is a plot where love overcomes a long - standing feud between two families. Two characters from the feuding families fall in love and their love is so strong that it starts to heal the pain and hatred that has been passed down through generations.
It's hard to say without actually reading the fanfiction. But it could be the classic pairing of a male and female lead. For example, in a Twilight - inspired fanfic, it might be Edward and Bella where Edward kisses Bella's pain away. Or it could be two best friends who have a deeper connection than they realize at first.
I'm not sure specifically as we don't have more details about this particular 'the pain of love novel'. But often in such novels, there is a male and a female lead. The male lead could be a brooding, complex character who has his own demons to fight.
Well, Naruto is obviously one of the main characters. He's the one who's going to be doing the beating. And Pain is also a main character in this context, as he is the opponent Naruto has to defeat.
Obviously, Naruto and Pain are the main characters. Naruto, the energetic and determined ninja from Konoha. Pain, on the other hand, is the complex antagonist with his own set of beliefs about peace through pain. Their interactions are likely to be the focus of the fanfiction.
Obviously, Naruto would be one of the main characters as it's about him being the son of Pain. Pain himself would also be a crucial character, even if he might not be physically present all the time. And characters like Sasuke, Sakura, and Kakashi would still likely play important roles as they are Naruto's friends and mentors in the original story and would have to interact with Naruto in this new, changed scenario.
Obviously, Harry would be one of the main characters. But there could also be new characters that the author creates for the story. Maybe there's a wise old wizard who takes Harry under his wing in the new place he moves to.
Obviously, Naruto and fem Pain are the main characters. Naruto, with his strong will and determination to protect his friends and the village. And fem Pain, who might have a different take on the Akatsuki's goals compared to the original Pain in the Naruto series.
Depending on the plot of the fanfiction, there could be a love interest for Pain's daughter. This character could be from a different clan or village. Their relationship could be a key aspect of the story, with all the challenges that come from their different backgrounds and the situation of the ninja world.
Well, it could be that there are other characters in the background. Maybe there's a character who will come to sakura's rescue. Or perhaps there's a character who is controlling 'pain' and making it do these things to sakura. But from the title, pain and sakura are the most prominent ones.