[quote=MistressCyanide]snip[/quote]

Oh, don't get me wrong - I'm sure it will work, I was just expressing my reservations. And I'm more than aware that a lot of people like the 'cons more than the 'bots too. Though, your comment about 'range' is a little flat, as there's a heck of a lot more characters than those in the cartoon to draw upon - and in continuities other than the original cartoon, both Prime and Megatron got a whole lot more character development, depth, and dimensions than 'truck and gun'. Which is why I mentioned the comics (again), as they're a much better source of characterisation than the old cartoons were, and indeed do have a lot of the grittiness and darkness that you're mentioning - 
For example, take [url=http://tfwiki.net/wiki/Empurata]Empurata[/url] as an example. 

I would seriously suggest giving the TF Wiki a look over. There's buttloads of cool stuff you're likely not aware of on there, especially if you're only going by the original cartoon.

Also, I imagine the characters will change and evolve in personality and such if the RP goes on for any length of time, as that's what happens.