Noob:

Noob is very common in your world! You can find noob in every biome. Obviously, he is not a hostile mob.

Pro:

Pro is a little bit more rarer than noob but he's 10x more better than noob because pro can defend himself from hostile mobs and he is also wearing a armor.

Hacker:

Hacker is a boss on this Add-on. Hacker has 1000 hearts and he's very powerful because he can spawn zombies. Hacker can only spawn in The End!

God:

God is also very powerful. God has unlimited hearts so he's kinda unkillable.

Herobrine:

Herobrine is the most powerful mob in this Add-on because he can fly, teleport, and he can also spawn Wither Skeletons.

Noob Vs Pro Vs Hacker Vs God Official Trailer Here: