Why not have all the characters be RoboRiders? Set it after the defeat of the Virus, with the planet's civilization having become dependent on deadly races for entertainment, negotiation and commerce. After that, the options are limitless!
Because there's more to the natives of Nova Orbis than that. If I went down that route, the larger story I have planned would fall apart. I get it if you're really nostalgic about the Roboriders and really really want to see SOMEBODY make a story about them, but... that's not what I'm here to do.