Hunter - Panther Eye or Shockroach, Charger - Gonome or Alien grunt or Shock trooper ,Tank - Baby gargantua, Common infected - Half life Zombies, Spitter - Alien Slave, Jockey - Headcrab or Pitdrone or snark, Smoker - Zombie HECU marine, Witch - Zombie Assassin. This what i think of with Half life enemies being in left 4 dead 2. Snark who is making Half life stuff for l4d2 Could maybe use this when making more half life infected.