This SurvivalModified Module introduces special Names which give Effects to the mob, depending on the Name.

You can always have a list of all effects using /trigger EffectNames ingame.

All Effects:

[No Despawn] Prevents mob from despawning.
[Despawn] Mob that previously was named 'No Despawn' can despawn again.
[Mute] Mutes mob entirely.
[Unmute] Unmutes muted mob.
[Ghost] Turns mob invisible with a white glow until renamed into anything else.
[Baby] Turns mob forever into a baby variant.
[Adult] Instantly turns mob into adult.
[Lefthanded] Turns mob into lefthanded variant.
[Righthanded] Turns mob into righthanded variant.
[Skeleton] Turns Zombie horse into Skeleton horse.
[Zombie] Turns Skeleton horse into Zombie horse.
[Glowing *color*] Makes the mob glow in the selected color (see Minecraft color code for all colors)
[Remove Glowing] Removes Glowing again.

After being named, the mobs will lose the Effect Name over their head again. Unless they are a ghost, you can name them whatever you want now.

For more info and how to install, visit the SurvivalModified Module Manager Submission.
If you have any further questions or found a bug for this module, please use the comment section below.