Making an OC isn't to hard. Consider their talent/ability that is semi unique to them. A personality. Are they a smart mouth? Friendly tp a faul;t? Trusting, or are they weary of all? Big, small, just mold the idea like a clump of clay. If all your OC's have a similar look, got for the opposite. Short hair, maybe androgenous looking in style, if all your chars are rail thin, go for something more msucly, or just big, like big mac. ^^ if you want other ideas let me. know.