Good morning, afternoon or evening, first of all, sorry for my English, I'm using Google Translator personalized.
examples:
-Being able to make an NPC have 300 hearts of life.
-That the NPC has a function of putting a custom praise as a drop when killing it.
-Mobs models implemented in Minecraft with other mobs.
-If it is a humanoid NPC, you can put weapons and armor from the game or other mods on it.

Most of this should be possible with the latest beta version.

Let me know 2-3 mob models you want to have, because at the moment it's not possible to add them dynamically, but happy to implement 2-3 mob model manually.