Spinal is obviously the 7th, considering they're revealing him on Halloween. (Skeletons) the 8th could be either Fulgore or Cinder; or possibly a new female/male character. I'd figure they would use Fulgores face as a symbol since everyone recognizes him by that. I don't think they would use such a minor detail on the back of his boots unless Double Helix is really trying to throw us off. Cinder if not, isn't in Season 1, He'll definitely be in Season 2. His Symbol will probably be the fire hazard symbol, then again that symbol shown for the 8th could be Ultra-Tech's weird way of a hazard symbol. Or like i said, a new male/female character. I'm fine with either or of the characters, they'll try to save the best for last and that will bring hype for Season 2.