Since I'm not familiar with the exact story, it's hard to say for sure who the main character is. But from the title, it seems that the main character is a female, referred to as'she'.
The main character is likely a woman. Given the title, she is the focus of the story. It could be a story about her personal journey, her emotions, and whatever events lead her to 'go back to black'. Maybe she's an ordinary woman facing extraordinary circumstances that cause this significant change in her life.
I'm not sure specifically which'she goes back to black' story you're referring to. It could be about a woman who has some sort of return to a dark or difficult state in her life. Maybe she has experienced a setback or is going through a tough emotional time that makes her feel as if she's 'going back to black', like a state of depression or a difficult past she's revisiting.
She could meet her younger self. This would be an interesting encounter as she could offer advice and guidance to her younger version. Maybe she could help her younger self to be less afraid of her powers.
Bella might meet her former teachers in Phoenix. These teachers could have a different view of her now that she has been through so much in Forks. They might offer her some words of wisdom or advice that could influence her decisions regarding her future. Also, she could meet some family friends who were part of her life before she moved to Forks. Meeting them could bring back a flood of memories and emotions, and they could play a role in her self - discovery process as she tries to figure out her place in both the Phoenix and Forks worlds.
There's a chance she could encounter her past enemies in a different context. Maybe she could find a way to befriend them or at least understand them better before they became foes. This could lead to preventing future conflicts. For example, if there was a villain who turned bad because of a misunderstanding, Sakura could clear it up in the past.
She could meet her younger self. It would be an interesting encounter as she could give advice to her younger version. Also, she might meet the earlier versions of her friends like Jiraiya and Orochimaru when they were all young and training together. Another possibility is that she could meet Hashirama Senju, the first Hokage, and learn from him directly about the founding of Konoha and his ideals.
She could become more independent. In 1918, she would be in a strange time without her usual support system. This would force her to rely on herself more, making her stronger.
Given the lack of information about the 'topanga goes black story', it's difficult to determine the main characters. However, if we assume that Topanga is the central figure, there might be characters associated with Topanga's life. It could be a love interest, a mentor, or even a rival. For example, if it's a coming - of - age story about Topanga, there could be a best friend who is with Topanga during the events that lead to the 'goes black' situation, or a parent figure who tries to help Topanga through it.
In 'Desmond goes back in time fanfiction', Desmond is surely a main character. He could meet his own family members from the past, and they could be important characters too. For instance, his great - grandfather might be a key character. There could also be a love interest for Desmond in the past, a local girl perhaps, who adds an element of romance to the story and also influences his actions and decisions while he's in the past.
There could also be characters from the past that become central to the story. For example, if they go back to the time of the First Hokage, Hashirama Senju could be a major character. Team 7 might interact with him, learn from him, or even have to work with or against him depending on the plot of the fanfiction.
Lincoln Loud would be a great choice. He's the main male character in the show and could easily be the one to introduce the idea of 'Back in Black' to his family, maybe after hearing the song at school or from a friend.