Panthereye (lvl 13) -- Panthereyes are quick, strong and resistant creatures, it's lack of ranged attack is compensed by it's dangerous leap if not avoided correctly.
Poison zombie (lvl 13) -- Poison Zombies are the slowest kind of zombies controlled by headcrabs, it has 3 black headcrabs on it's back it can throws toward it's victim as ranged attacks.
Parasite (lvl 6) -- Parasites are the fastest and second weakest creature in the game, their lack of power compensate by their highly-hazardous poisoneous bite that can kills any targets in the next couple of seconds it's been bitten.
Pit Drone (lvl 14) -- A weak but versatile creature that is able to switch between ranged and close combat mode, while not very fast, it can deal a lot of damage if you let it comes close, like Bullsquids, Pit Drones will only use melee attacks if their target comes to them
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