- Motto: "Freelance shitposting agent, yes?"
- Weapon: Megaton Battle Sword
Design wise, it's probably RID (2001) Prime. Mainly because I love that toy with all my heart. Never watched the show though. Movie, Armada and Cybertron come in close seconds though.
Character wise, I'd have to go for Movieverse. He's like G1 Optimus, but a million times more badass. He's a wise, battle-hardened hero who doesn't take **** from anyone and will defend his comrades to the last. Hurt his fellow Autobots or innocent humans and he WILL kill you. I know people accuse him of being bloodthirsty, but I think his willingness to say "enough is enough" and kick arse is what makes him so awesome. He's not just a "good guy" he's a war hero- and considering Peter Cullen based Optimus Prime on his Vietnam veteran brother, that's just awesome.
Design wise, I'd have to say Armada. It's a shame his toy is a bit of a brick, because his design, with the huge, armoured legs, clawed fists, shoulder pylons and freakin' horns is just awesome. He looks like a real tyrant, and one who can kill you to death at that. Runners up include RID and Movie, and also the other Unicron Trilogy designs (Energon Megatron looks a little tubby and is a bit too Galvatron for my liking, and Cybertron Megatron is almost perfect, but sweet Primus those colours! They're both awesome though).
Character wise, I know he doesn't really count, but as far as I'm concerned there is only 1 answer- Beast Wars Megatron. This guy just stole the show as far as I'm concerned- which is saying something as TRUKK NOT MUNKY aside (I still think Prime/Primal should have been a lion) Beast Wars is probably my favourite Transformers cartoon ever. David Kaye's performance was absolutely fantastic, really giving him that charming-yet-evil voice we all love, and he was exceptionally competent compared to his other namesakes. And not only was he evil, he was funny too! Some of his one-liners were brilliant, and who could forget his trademark "Yesss..."?
So yeah. I love BW Megs. A close second place would be Unicron Trilogy Megatron, specifically his Cybertron incarnation, who was gloriously evil. Movie Megatron was cool too, due to just how bloody terrifying he is.