Emerald

Emerald is a green Gem who has the ability to accelerate. His speed is limited to Mach 1 (the speed of sound), but if he wears his tachyonic suit, he could go beyond the boundaries of scientific laws. When wearing his suit, he's often known as "The Speed Demon", given his apperance.

Also, as Gems have no known gender, he also uses female pronouns from time to time.

More to be written later.