The young nephew of Barry Allen and Iris West Allen, Wally West was visiting his uncle's laboratory when a bolt of lightning shattered a rack of chemicals in the room. The chemicals spilled on the boy and duplicated the same accident that gave Barry Allen his powers.
Becoming the first Kid Flash, after the events of Crisis on Infinite Earths when Barry Allen gave his life to stop the Anti-Monitor's space cannon, Wally assumed the mantle of the Flash. Despite Wally being the slowest Flash, only running at the speed of sound, he eventually came to grips with his fear of replacing Barry Allen and removed the mental block he had placed on himself, thus becoming the fastest Flash ever.
Leading a notable superhero career, Wally eventually fell in love and married his girlfriend, television reporter, Linda Park and they had two children Jai West and Iris West II, both of whom inherited their fathers powers.
While similar in design, the difference between the suits of Wally West and Barry Allen are the lightning bolt "belts" on the suits' waists'; Wally's belt separates into lightning bolt points at the front while Barry's continues unbroken.
The Flash, in comparison to the likes of Superman (who "soars above everyone"), Batman (who "hides from everyone"), and Wonder Woman (who "preaches to everyone"), is considered to be the kind of hero who "runs alongside everyone".