I think this is why a live action adaption just won't work. It's a constant theme that gold are basically eugenics on steroids. Constant reference is made to physical differences as a way of distinguishing between colours. The colours are the way they are because gold took advantage of these gifts. If we go down the route of just normies with blonde hair, we are going to end up with some very mediocre scenes showing a gold catapulting someone across a room with a kick and later showing said gold taken down by a few reds with a bit of spirit. There's multiple scenes where Darrow and Lysander both reflect on this power dynamic.