Here is a Unreal Engine rig I made for a game called The Grand Bermuda.
Model created by the fantastic Vivian Bull. Concept created in collaboration with Vivian as well.
https://www.artstation.com/vivianbull
Everything on this rig was made in Unreal Engine and combines procedural and real time physics to create fluid natural secondary motions.
The hair is completely real time physics but is baked out in game. It is controlled by the head with collision to the world and herself allowing for realistic reactions to the environment. The tail uses Rig Harmonics Chain which allows the tail to gently sway adding a layer of unevenness to animations.
Siren Tech Animation Showcase Video
Procedural hair physics
Chain harmonics for procedural tail movement that fully bakes out