Combined Monsters (edited)

 There are only a few certain mobs that are combined together to make horrid hybrid of the two like the zombie pigmen and the zombie villager. Adding more combinations of hybrid monsters would add another aspect of scariness to the game. For example there should skeleton zombies which is similar to the zombie pigmen but is half zombie and half skeleton, there is a 50% chance of them having a bow and 50% chance that they have no weapon. Or a slimy creeper that has some slime coming out of a creeper that spawns only in slime chunks, and will explode covering the explosion area to be covered in slime. A zombie spider will also be scary, maybe a half zombie half spider face with spider legs and a poisonous body would act scarier, like the spider it will climb and jump at you but will drop rotten flesh when killed.