Quicksilver

Quicksilver is the 'mutant' name of a protagonist, and sometimes antagonist, of Marvel's line of X-Men and Avengers comics. His real name is Pietro Maximoff, and he is the son of Magneto. His mutant name is a reference to his ability of moving and thinking at superhuman speeds, and the fact he is typically depicted with silver hair. He is portrayed by actors Evan Peters in Fox's X-Men film series, and Aaron Taylor-Johnson in Disney's The Avengers film series.

This is also the super-hero name of DC comics protagonist Max Mercury, who is also capable of super-human speed. He is sometimes known as Mercury.