Sound is a villain who utilizes sound to his advantage.
Users become stronger, faster, more durable, etc. when they come in contact with sound, possibly unlocking abilities related to the affinity and enhancing the existing powers. Some users may be able draw sustenance from the sound or even slow or stop aging.
The user can absorb sound waves and neutralize any potentially harmful effects.
User can increase the strength, duration, and potential of sound to it's fullest, the effects may change depending on the original effects of the sound that has now been amplified.
The user can infuse objects (usually a weapon) with sound, empowering and energizing them and allowing the user to manipulate their qualities and efficiency, using sound for various effects.
The user can release/use sound to attacks of various shapes and/or intensities, either projected, used as a part of melee attacks, etc.
Sound can fly by "walking" on sound waves. So to fly all he has to do is snap his fingers and ride the sound wave at the speed of sound.
Back Story Edit
Sound is the younger brother of Veloster who was turned evil thanks to the super-villain Shot-Boy who shot a microscopic arrow into his brainwaves which changed them into evil ones. He used to be a high class hero who worked with his brother but now he is his arch nemesis.