To get the 2 blank ones the one with a hat is a farmer.They spawn in a special wave called the medieval wave same with the executior and the one with the crown is king zombie he spawns in his own wave and it's a boss fight also the game got updated with special pirate zombies
its such a shame that i cant send the screen shot i killed the king zombie TIPS zombie boss wave and the king spawn in the middle of the mountain and you have to kill it but theres other players your lucky if you killed it