The Flash (DC Comics)
* Claim to fame: Can move at the speed of light and beyond, manipulating time itself.
* Why he might be the fastest: He's often portrayed as having near-infinite speed, capable of traveling through time and dimensions.
Superman (DC Comics)
* Claim to fame: Can fly faster than a speeding bullet.
* Why he might be the fastest: His speed is portrayed as being incredibly fast, but he's not usually depicted as being able to travel at the speed of light or manipulate time.
The Silver Surfer (Marvel Comics)
* Claim to fame: Can surf through space at near light speeds.
* Why he might be the fastest: His cosmic surfboard allows him to travel at immense speeds through the vacuum of space.
Quicksilver (Marvel Comics)
* Claim to fame: Can move at superhuman speeds, but not as fast as The Flash.
* Why he might be the fastest: His speed is often portrayed as being faster than other super-speedsters, such as Spider-Man.
The Speed Demon (Marvel Comics)
* Claim to fame: A cosmic being who can travel at the speed of light.
* Why he might be the fastest: He has shown the ability to match The Flash's speed on several occasions.
Ultimately, who is the fastest is subjective and depends on how you define "fastest." Some may argue for The Flash due to his time manipulation abilities, while others may favor The Silver Surfer due to his cosmic speed.