One key element is her race, the Zen - Whoberi. Another is that Thanos is the one who destroyed her home and took her. Her upbringing by Thanos, where she was trained to be a deadly fighter, is also important. And finally, her decision to turn against Thanos is a crucial part of her back story.
The key elements are her origin from the Zen - Whoberi, Thanos killing half of her people and adopting her, and her transformation from being Thanos' assassin to a hero.
One key element is the destruction of her home planet which left her alone. Then Thanos coming into her life and making her his protégé is crucial. Also, the training she received from Thanos which made her a force to be reckoned with in combat is an important part of her origin story.
Gamora's back story starts with her being from the Zen - Whoberi. Thanos, the mad Titan, came and decimated her people. He took Gamora with him. Growing up under Thanos' shadow was no easy feat. She was exposed to all kinds of violence and immoral acts. But Gamora was not completely lost. She had her own will. She learned combat skills from Thanos and his minions. As she grew older, she started to question Thanos' motives more and more. Eventually, she made the decision to oppose him, which put her on a path to become a hero. She joined forces with the Guardians of the Galaxy and fought against her adopted father's evil plans.
Well, one key element is that there was this serial killer, Charles Lee Ray. He was on the run from the cops. Then there's the voodoo aspect. He managed to use voodoo to get his soul into the doll. And of course, the fact that he could then use the doll's form to carry out his evil deeds, which is also a very important part of his back story.
One key element is his life in Ionia before the accusation. He was part of a community of swordsmen. Then, of course, the sudden accusation which turned his world upside down. His exile made him a pariah. He had to fight not only for survival but also to prove his innocence. And throughout all this, his swordsmanship evolved as he faced various foes during his exile.
Immortality and his time as a thief are key elements.
One key element is his super - speed. It's what makes Sonic unique and able to take on Dr. Eggman. Another is his world with different zones like Green Hill Zone. Also, the presence of Dr. Eggman as his main antagonist is crucial.
One key element is Negan's pre - apocalyptic existence. We don't know a whole lot about it, but it's the starting point. Next, the Saviors. He built this group from the ground up. It became his power base. The way he ruled the Saviors, with an iron fist, is also part of his back story. And Lucille, his beloved bat. It was named after his wife, and it was a tool for him to enforce his will. His wife's death also played a role. It was a catalyst for his transformation into the ruthless leader we know. All these aspects intertwine to form the complex back story of Negan.
One key element is his Chiss origin. It shapes his identity and how he approaches things. Another is his entry into the Galactic Empire and his rise through its military ranks.
One key element is his Russian military origin. Another is his training for special operations.
The key elements in Negan's back story include his ordinary life before the apocalypse which was a contrast to what he became. His relationship with his wife Lucille was crucial. When she died or was lost to him, it was like a turning point. After that, he started building the Saviors, a group that was based on fear and dominance. His leadership style within the Saviors, where he demanded absolute obedience, was also an important part of his back story.