Immortal (based from SC2)

5 levels
Spawn with pump shotgun and deagle (race limited to these and nades)

Hardened shield: Your shield protects you. 20-60% chance to reduce the damage of incoming attacks to a maximum of 70-30 damage
Pushback: The force of your attacks cause the opponent to loose their balance. 10-40% chance of shaking your opponents screen
Regeneration: Regenerate your shield. Regain 2 hp every 5-1 seconds
Hand cannon: Payback time. All damage is doubled for 3-10 seconds

In starcraft, the immortal is the tank of your army. He leads, and soaks up any meaningful damage from the enemy. He is however vulnerable to fast firing units like the marine, because the hardened shield only limits the maximum damage in one hit. This translates over to WCS in that the hardened shield will do very little to submachines etc. The immortal also deals massive damage to armoured units but does relatively poorly vs unarmoured. But its kind of hard to translate that into WCS, thus the ultimate. It could be immortality, but then I think it would be too like shadow hunter, what with the regen as well. The shotgun seems to be the most logical gun to give it, since the immortal does slow but powerful hits

In WCS, this race is would basically be for rushing in head first, dealing damage with the shotgun, then getting out and regening. The immortal leads. In terms of items to restrict, I think the helm might be an option, because of the hardened shield ability. Other items, I dont know, Ill let you decide