Seeing as how I have a friend in here, think I'll give this a try myself.
Name: Wally Slick (Actual name is Wallace Smith, but he thought it sounded boring.) Hero name: Sign Punk Gender- Male Age-20
Power-Is able to use road signs to invoke powers associated with the type. In particular, he can use stop signs to make a barrier around himself that stops all inertia in an area (Give or take, it doesn't stop all motion, as long as they're slow enough.). slow signs to decrease the movement speed in an area, and one way signs to only allow movement in one direction. These forces also affect him, and he can't control who it affects, just if the effect is active. There's also a limit to how big the effect is, so creatures or objects that are too big won't be affected, and if something has enough strength or speed, they can overcome the effect entirely.
He's also trained himself to be observant and fast, as well as using jet powered roller blades... thugh those are more accessories and trained abilities then powers.
Personality- Wally is a bit full of himself, thinking his power is more impressive than others, and will run his mouth off at anyone who disagrees. In reality, he's a bit of a coward with a heart of gold, as he genuinely cares about being a hero and helping others. Ultimately, he likes to put on a big show, even though his main strategy is hit and run, before finishing off his opponent while they're weak. Effective, if not glamorous.
Appearance- Wally is skinny, and about 5'11. Though he has some toned musculature, ultimately he looks rather gangly. This is emphasized by his mohawk and nose, lip, brow and ear piercings, giving him a threatening look. His hair is dyed red, while his tongue is bizarrely long(Also pierced). Further, even though he uses rollerblades, he wears no safety equipment, so his knees and elbows almost always have bandaids on them, along with scrapes and bruises all over his arms and legs.
His costume consists of short, baggy shorts, a grey tank top and a black jacket with the sleeves ripped off and several punk band pins placed on it.
I hope this is satisfactory.
(Edit!) An addendum to his powers. He doesn't have to use only legal road signs. He can use fake one, or objects that look like the as long as they have the correct color and letters. It also doesn't have to be made of metal. It can be painted onto a surface, and it will work. However, smaller they are, the easier they are to use, but the less power he can get out of them. The bigger they are, the more power, but the harder he needs to concentrate.