The Whizzer
The Whizzer - goofy name and goofy origin. It all starts as young Bob Frank comes down with a fever while visiting Africa. While lying near death, a cobra bites and poisons him. His father, a doctor, tried to save him by injecting him with mongoose blood (Because mongooses kill cobras, y'know?). And not only does it work, it grants him the proportionate speed of a human-sized mongoose.
I can understand why you might call yourself the Whizzer if you had super-speed. But why would you choose a bright yellow costume? Might as well make your slogan "Gotta go!".