Quicksilver

Quicksilver is a villain-turned-hero from Marvel's X-Men comics and media. Originally serving Magneto as a member of his Brotherhood of Evil Mutants, along with his twin-sister the Scarlet Witch, Quicksilver and his sister eventually abandoned the Brotherhood and sought out new lives as heroes by joining the Avengers. Quicksilver's viscious temper, arrogance and mental instability has resulted in him acting as both "hero" and "villain" multiple times during his life.

Origin
Quicksilver is the biological son of Magneto and the twin brother of Scarlet Witch. For most of his life, Quicksilver knew nothing of his father, because his mother, Magda, fled from Magneto after he killed a mob of people with his powers. However, like his father, Quicksilver became resentful of humans. He was a member of his father's original Brotherhood of Evil Mutants, although at the time neither he nor his sister knew of their paternity, nor did Magneto know he was their father.

Quicksilver and his sister joined the Avengers team of heroes at one point, but later defected when Scarlet Witch went insane and Quicksilver tried to use her unstable power to take over the world.

Powers and Abilities
Quicksilver is a mutant born with the ability to move, react, and think at super-human speeds. He is able to reach Mach 5, and can run up walls and across water. At one point he was exposed to the mystic Terrigen Mists and was granted even more power, able to run faster than time and could go into the near future.