Steve Rogers took the Super Soldier to fight off against Red-Skull, then climbed on a missile and froze. Then he was un-frozen in 2013.
Barry Allen gained his powers by get struck by a lightning during an explosion. Then he got super fast.
Ex-Robin Dick Grayson retired from Robin, and became Nightwing.
Scott Lang used to be a criminal, but one day he became Ant Man
Oliver Queen was stranded in an island for 5 years, and when he came back Star City was full of crime. So he became Arrow
Peter Maximoff was born with his Super Speed. He joined the X-men as Quicksilver.
Bruce Banner was experimenting with radioactive chemicals which caused an explosion. He got his powers in that explosion. Now he fights crime as the giant Incredible Hulk!
3 -Spider Man
Peter Parker got his power when he was bit by a radioactive spider. Now he fights crime as Spider-Man.
Wade Wilson was going to die because of cancer, he went to a place where people told him they could cure him, but really they wanted to bring his inner mutant by torturing him and it worked. YOU CAN’T KILL HIM!
Logan was born a mutant with bone claws, some people kidnapped him and put him in the Weapon X project that gave him Adamantium skeleton, Adamantium claws, and enhanced his powers making him immortal. He later joined the X-men.