TF2: Scout, fast and dodgy
RTS: Anything with mobility, firepower is nothing in the face of fast moves, a fast mind and faster hands. (so yeah, Dark Eldar basically, i had been waiting so long for them to come out based on a personal love (play both them and nids in RL) but then found out they were a considerable improvement on tau in terms of maneuverability, and now my horde of 20 Jetbikes can be seen roaring about in their bright pink paint... humiliation is everything... both the pink and the fact you just lost to 20 jetbikes)
I just hate turtlers (why i love DoW) and nothing cracks open those coward-eggs like the ability to put down a fast, hard hail of hurt.
FPS: Support mostly, i like to stay on the sidelines until i get the word to put some shrapnel in an offending party... rocket style.
RPG: Orc with a mace.
Its Occam's razor... but more blunt.
hell, i just like the idea of my enemy going;
"ive shot him with every arrow, spell and curse i know... and the bastard is STILL COMING AT ME!!!!"
EDIT: i decided to put this double post to good use.