Do they have scales or hair or both?
They are pure hair; true Saiyans (like Goku and Vegeta) are born with a very fixed hairstyle, and they do not grow (or shrink) in their whole lives, even after their death.
Speaking of the powers that be, does anyone know how many variations of Dragon Balls there are? I spent a few hours watching old Dragon Balls videos on YouTube just to figure out what character was in afbitcoins avatar... turns out it isn't Vegeta! Who knew?
That's a Vegito SSJ (the fusion between Goku and Vegeta) fanart.
AMA related to Dragon Balls!

Doesn't look very vegito to me, Vegito has that blue and orange jumpsuit.
That's because it's a fan-art.