the usual suspects like the cast of Beast Wars.

Demolishor (Armada/Energon Demo was the only good thing about the energon toon, the only character to be vaguely interesting. Then they went and lobotomised him. yay )
Sky-Byte (I'm not 100% on what makes him great, he is just awesome.)
RID Scourge (Awesome enough to forgive the knock-on effect of Nemesis Prime)
BM Strika (Best Fembot Evar!)
Lugnut!
Lockdown!