Many superheroes are defined by their ability to adapt to and overcome circumstances that they may not have planned for. TNT Todd, for instance, chose to use his tragic accident involving TNT and Magnetic X-19 as an excuse to put on a funky costume and fight crime. The Stuntman's adaptation may not be the most interesting or notable, but it is certainly one of them (and you'll have to forgive me, I'm running out of interesting heroes to cover here).
The Stuntman was, as his name would suggest, a circus acrobat by the name of Fred Drake. Part of a trio in fact until, one day, the other two members got murdered. Naturally, he tried to solve their murders, but got sidetracked when Don Daring hired him to be his stunt double... but that's when he got an idea. What if he put on that costume Don gave him... and fought crime? Absurd, I know, but that's what he did.
Once he solved the murder of his friends, he went on to have a long crimefighting career of 9 issues, jumping between various comic lines like the acrobat he is (seriously, almost every appearance from him is a different comic line: 3 issues of his own self-titled series, Green Hornet Fights Crime #39, Black Cat #9, Thrills of Tomorrow #19-20, All-New Comics #13 and Joe Palooka Comics #9 - just pick a series!)