If we're referring to twinks,
Classic:
Demonz, Toor, Xoor (Shadowburn Battlegroup)
Tbc:
Painaid, Spellwarlock, Cptjack, Disease/Santic (Retaliation Battlegroup)
Cirran, Mythos, Deathstone, Hiredhit, Cloudkill, Ctrlsheep, Noein and several others that played on the PTR
Folks from <No Mercy>...