Flash (or The Flash) is a superhero and is a member of the Justice League. He is a spawn-able NPC in Scribblenauts Unmasked. In the game, he can run super fast and fights Villains or any other type of bud guy.
Here is a list of variants (Please note that all variants ARE NOT listed):
One day, Barry Allen was in his lab when a freak lightning bolt hits a nearby self that has chemicals on it, causing the chemicals to splash all over Barry. Afterwards, he discovered he had the power to run at super-sonic speeds. He decided to use his powers for good and become a superhero. Eventually, he became a member of the Justice League and one of the worlds greatest heroes!
Some of The Flash's enemys are known to be in the game, such as: Captain Cold and Professor Zoom.