The key element is his scientific background as an astrophysicist. Another is the failed experiment that changed him. Also, Talon's involvement in recruiting him is important.
Sigma's origin story is quite tragic. He was a brilliant astrophysicist. But his experiments got out of control. He was exposed to some sort of strange energy or force. This exposure not only changed him physically but also mentally. He became a powerful but unstable force in the Overwatch universe, and his powers were then harnessed by Talon, who saw his potential for chaos and destruction.
Lucio's origin story is quite interesting. He was born in Rio de Janeiro. In his city, there were a lot of problems, like the poor being oppressed. Lucio used his music as a tool for change. His sonic technology was not just for entertainment but also to fight against the injustice. He started by using his music to boost the morale of the people in his community and later became a key figure in the fight for a better life in Rio.
The main elements include his birthplace, Rio de Janeiro. Also, the social problems in the city like inequality. His love for music which led to the development of his sonic powers. And his motivation to use those powers for the betterment of his community and later in the fight against injustice.
In Roadhog's origin story, his Australian heritage is fundamental. The Omnic Crisis had a devastating impact on Australia, creating a landscape of poverty and lawlessness that he had to navigate. His decision to become a criminal was influenced by this context. His mask is not just a cosmetic feature but a key part of his identity. It could signify his detachment from society or his attempt to create a new, intimidating persona. His Scrap Gun and hook abilities are also central. The Scrap Gun, made from the debris of a broken world, and the hook, which he uses to assert his dominance in combat, are both products of his origin in the desolate post - Omnic Crisis Australia.
Roadhog was once a member of the Australian Liberation Front. After the Omnic Crisis, Australia faced a lot of chaos. He turned to a life of crime. His large size and brute strength, along with his signature hook and shotgun, made him a feared figure. His mask is also part of his iconic look, hiding his face perhaps to add to his menacing aura.
From the origin story, we might discover their motivation for joining Overwatch. It could be revenge for something that happened to their family or a desire to protect the world. Also, we may find out how they got their unique abilities. For example, if they were exposed to some strange energy source or had a special mentor who trained them.
Well, first of all, her joining Overwatch as one of its initial members is a big part of her origin. Then, her presumed death in action was a major event. This led to her being out of the picture for a while. Later, when she came back, it was also a significant event as she had to regain her place and deal with the changes that had occurred in Overwatch during her absence.