One main element is her discovery in the scrapyard. Another is her lost memories. Also, her combat skills suggest a trained past.
Alita was found among the scrapheap, her body in a dilapidated state. Her back story is shrouded in mystery. It's clear that she has a unique origin. She has these remnants of a past life that she doesn't fully understand yet. For example, her fighting style is so refined that it must have been ingrained in her from before. There could have been a great war or some sort of technological upheaval in her past that led to her being where she was found. As she interacts with the people in her new environment, she starts to get flashes of her past, like a distant memory of a place or a person. It's a journey of self - discovery for her as she tries to piece together her back story from the fragments of her memory.
One main element is his difficult upbringing in poverty - stricken surroundings. Another is the constant bullying and discrimination he endured due to his physical appearance. And of course, his strong bond with his sister Daki. This bond was what drove him to protect her at all costs and also influenced his actions as a demon. For example, he would go to great lengths to avenge any harm done to her because of their shared experiences of being outcasts in society.
The main element is that he was a young person from Illinois. Another is his motivation to go to Kenosha during the unrest. And of course, the fact that he was armed when he got there.
The main element is his planet's difficult situation. Also, the death of his family.
The main elements are his dual heritage, human and Atlantean. His birth from a human father and Atlantean mother.
Well, if we assume Moira is a character in a fantasy setting, her back story could involve magic. Perhaps she discovered her magical abilities at a young age, but it was a struggle because magic was frowned upon in her community. This led her to hide her powers at first, but later she found a group of like - minded people who accepted her, and that was a major part of her back story.
The main elements of Quicksilver's back story include his origin in Sokovia. The place was full of chaos and war, which influenced his character. His powers of super - speed, which were a result of Hydra's unethical experiments on him and his sister. Also, his relationship with his sister Wanda is central. They shared a lot of experiences together, from their difficult childhood to their time as part of superhero groups. His interactions with other superheroes, whether as an ally or sometimes in conflict, are also important parts of his back story.
The main element is his angelic origin. He was created as an angel. Another is his encounter with the Winchesters which changed his perspective.
One main element is her origin in a particular community. Another is her discovery of her powers at a young age.
The main element is Charles Lee Ray. He is the one whose soul gets transferred into the doll. Another element is voodoo, which enables this transfer. Also, his desire to continue his killing spree even in the form of a doll.