Hard to say. Probably some one from Beast Wars, from Prime, from Animated, from Cybertron (Unicron trilogy), or a Dinobot.
For toy, I'd have to go with Cybertron Optimus Prime.
I found this. It made me laugh... so... much.
Toy: eather Evasion mode Optimus prime or classics Megatron.
Character: Soundwave (and IDW Whirl.
Combiner: BruticusAutobot: IronhideDecepticon: Shockwave
Toy:Probably either Combiner Wars Brawl or Titans Return Wolfwire.
I love the Cykill figure I bought at the flea market.