Well, Sakura also has a presence in Naruto Pain Arc fanfiction. Some fanfictions might focus on her role during the Pain invasion. She could be shown as having a more significant part in the battle, like coming up with medical strategies to deal with the aftermath of Pain's attacks. Hinata is also popular. Her confession to Naruto during the Pain arc is a big moment, and fanfictions might expand on that relationship, either making it progress faster or exploring her feelings in more detail.
Naruto is definitely one of the most popular characters. Since he is the main protagonist in the original arc, he often takes center stage in fanfiction too. His growth, his new jutsu, and his interactions with Pain are frequently explored. Another popular character is Pain himself. His complex motives and powerful abilities make him an interesting subject. Writers often try to humanize him more in fanfiction.
Itachi is often included in Naruto Pain Arc fanfiction even though he wasn't directly involved in the arc. His influence on Sasuke, who was part of Konoha at the time, could be explored. Also, his powerful jutsu and his own complex backstory can be intertwined with the events of the Pain arc. Kakashi is another popular character. His experience and knowledge could be used in fanfiction to come up with different ways to counter Pain's attacks or to understand the situation better.
In addition to the main characters, some of the villains like Cinder also get a lot of attention in fanfictions. Writers like to explore her motives more deeply. Maybe she has a more sympathetic backstory that wasn't fully shown in the original. Or perhaps they write about her relationship with other villains in a more detailed way than the show.
Konan could be really interesting. In some fanfictions, she might have a different backstory or motivation that affects the Naruto vs Pain fight. For example, she could be secretly trying to stop Pain from going too far in his destruction of the Leaf Village.
Naruto is, of course, very memorable. His determination to protect the village against Pain is always a central and inspiring part of any such fanfiction.
Lucy is another popular choice. In the Edolas arc, her intelligence and determination can shine through. Maybe she's the one who figures out how to navigate the strange new world and its magic, and her relationships with the Edolas versions of the characters can be explored in interesting ways.
Well, in Naruto Pain Arc fanfiction, a common concept is the idea of different character interactions. For instance, how the other villagers of Konoha interact with Pain during his invasion. Some fanfictions might show certain villagers trying to understand his motives rather than just seeing him as an enemy. Also, there could be concepts about the after - effects of Pain's attack on Konoha. Like how the village rebuilds not only physically but also emotionally and politically.
Tony Stark himself is obviously a very popular character. He is the central figure associated with the arc reactor, and fanfictions often revolve around his experiences, emotions, and adventures related to it.
Friendship is also a big theme. Since they start as enemies, fanfictions like to show how they can develop a deep friendship. They might start to understand each other's past traumas and find common ground, leading to a strong bond that was not present in the original story.
Gray is another character that features prominently. His cool - headedness (well, most of the time) and ice - make magic can provide an interesting contrast to Daphne's actions. In fanfictions, he could be the one who figures out the weaknesses in Daphne's plans through his logical thinking.
In many fanfictions, after the Pain arc, Naruto and Hinata's relationship often deepens. Naruto starts to see Hinata in a new light. He realizes her strength and her unwavering feelings for him. This can lead to more interactions between them, like Naruto becoming more protective of Hinata and Hinata being more confident in expressing her love for Naruto.
Kazuhira Miller is another popular character. He's Big Boss's right - hand man, and his own backstory, including his time in the CIA and his loyalty to Big Boss, can be explored in fanfiction. You can write about his role in building Mother Base, his strategic thinking during missions, and his interactions with the other members of Diamond Dogs.