Well I was meaning to do just a couple of zombies:
The slow ones- they can take more shots but they are slow and... well slow
The fast zombies-they can take less hits but they are fast and can kill you very quickly
Brutes- big, mutated zombies, they are the slowest but can take even more hits and can hurt you really bad.
Of course they would all have two or three variants so they wouldn't be so repetitive.
PS Could someone just make the rotation thing for me with these pictures in the archive so I can learn from that. And if you have free time you could also make the enemy rotation towards the player cause I don't really get how to do that. I know , I'm dumb but what can you do