SCP Foundation PE 1.17+

this addon adds New monsters from SCP Foundation, it's a very scary addon to play around with and will definitely spice up Minecraft for ya.

SCP-173: is a very hostile mob, SCP-173 won't be able to move if it's being looked at by the this mob will make players blink so it can get to attack them easier.

SCP-049: or you can call it plague doctor, this mob will infect villager and turn them into zombie just like the normal zombie, he players and give them wither effect will turn the human mob into SCP-049-2 (Zombie), you can give the red flower for SCP-049 and he will become docile for 30.