So yeah..... this is different for sure. But I can't help but notice some odd mold vibes I get.
Optimus Prime = Cybertron Optimus Prime
Prowl (Black one) = Cybertron Ransack
Ratchet = Energon Towline (the overall shape and shoulder design)
Bumblebee = Classics Bumblebee
Bulkhead = Maybe a remolded protoform toy... i dunno...
What do you think?