Can you briefly tell Nagini's back story?

Well, Nagini has a rather tragic back story. As a Maledictus, she was doomed from the start. Her transformation into a snake was a slow and painful process. In the wizarding world, being a Maledictus set her apart. And when Voldemort came into the picture, he exploited her situation. He saw the potential in her as a Horcrux. Nagini, in her snake form, was then used by Voldemort to do his bidding, whether it was spying or attacking his enemies. She was a key part of his evil plans.

Sure. Nagini was Voldemort's snake and a Horcrux in Harry Potter.

Durga's back story is about her being formed by the gods to fight Mahishasura. She had great power and slew the demon.

Sure. Biden grew up in Pennsylvania. He entered politics early and has had a long career in the Senate. He overcame personal losses and is now President of the US.

Peter Parker, an ordinary student, was bitten by a special spider. This led to him having powers. His uncle Ben's death made him decide to use those powers for good as Spiderman.

Sure. Billy Batson is a kid who becomes Shazam. An old wizard gives him the power. He says 'Shazam' and turns into a super - hero.

Sure. Mimikyu disguises as Pikachu because it's self - conscious about its own look.

Cinderella's back story is that her mother died, and then she was stuck with a mean stepmother and two unkind stepsisters. They treated her poorly and made her do all the menial tasks around the house.

Vegeta was a Saiyan prince. His planet was gone, so he landed on Earth with the intention of conquering it. But he ended up evolving into a protector of Earth after many battles and experiences here.

Sure. Diana is from Themyscira. Made from clay, she's an Amazon. Steve Trevor's arrival leads her to leave for the outside world to fight for justice, becoming Wonder Woman.