This is my attempt to restore all protected, essential, unique flags for all NPCs in Skyrim Special/Anniversary Edition that  are erroneously altered by WICO VNL v0.9f . To achieve this goal, I followed a guide I've found on reddit, and proposed by "FinnenHawke" user. You can find the guide HERE

Basically, what I did was taking the original "WICO - Immersive People.esp", which effectively modifies NPCs in the whole skyrim game, and used some automatic script to restore all ACBS values to the correct values, in the following order
- Skyrim base game
- Dawnguard
- Heartfire
- Dragonborn
- Unofficial Skyrim Special Edition Patch

This means that all non essential nps will be marked as such, as it is in the original game and according to any fix coming from USSEP.  Please note that you don't really need USSEP installed, although I highly suggest using it.

NOTE ON THE USE OF WICO AND USSEP : you'll still need to use the WICO-USSEP patch that's included in the original WICO mod package. My patch simply restores the essential,unique,protected flags as they should have been, while keeping WICO appearance changes.

Installation instructions :
- download WICO VNL v 0.9f
- extract all its data together with WICO - Immersive People.esp and WICO - Immersive Characters.esp
- replace the original WICO - Immersive People.esp with the one from this patch
- use any compatibility patch originally made for WICO, such as the USSEP Patch (or Realistic RS Children to also cover children)