Thanks Terchen for the helpful guide!

Here are the race IDs from different mods that i had to add manually:

anango ID=tsb_anango
automaton ID=dadzioautomaton
maskhulk(2heads) ID=dadziomaskhulk2h
maskhulk(1head, optional) ID=dadziomaskhulk
vinekind ID=dadziovineman
undead ID=zombie_jugable
apatorre ID=im_moff
skeleton ID=dadzioskeleton
forgotten ID=pf_forgotten
scuderi ID=scuderi
goblin ID=goblinplus
wulvari ID=wulvari

NOTE: there's not every races from every mods existing, read the comment below if you want to add one that is not in the list.

Here a guide to find a race ID of any race from any mod:

1. Go to C:\Program Files (x86)\Steam\steamapps\workshop\content\1224290
2. Search for the mod that contain the race you want to add. The mod ID can be found on it's steam page URL, example: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id= 2808230100
3. Search for a txt file that contains "ActorType" (easily done with CTRL + F), example: [ActorType] ID= race_id ;
4. Follow Mafe's guide to add the race ID to his mod

NOTE n°2: ActorTypes can also be monsters, which leads to a goofy moment where you can recruit a monster. I would not recommend it though because if you give a human class to a monster, the "humanoid animation" can lead to the game to softblock when used by a non-humanoid actor.
So make sure to pick the desired ActorType (races usually have a description, mobs doesn't).

Nice mod! It helps make the world feel more alive. And the outlining a tutorial for additions is much appreciated!