This mod solves many of the issues plaguing hybrids in the sims 4. Now you can safely play hybrids without fear of the game randomly deciding to break your sims.
Some of the main features are:
Safely take your hybrids into CAS and save them to your gallery without the fear of the game deleting their occult forms. Sim must spawn in live mode at least once to enable this protection.
Allow servos to become vampires, witches and aliens.
Properly render spellcaster charge and curses for spellcaster-vampire hybrids.
Mermaid hybrids correctly switch to and from their tail forms without being stuck swimming on land.
Newly-generated aliens no longer have their human form re-randomized (intended for story progression mods which populate towns with sims from your gallery).
And many more…