Let it be clear: This mod will probably break immersion. I made this for personal use but decided to post. This will change random unimportant npcs into non-humans, so if you feel the need to fill your witchery world with some elves, dwarves and halflings, this is it! I recommend using this mod if you've already played the game and just want to play around. Also, I think some non-important human npcs will become non-humans with little dialogue. This was not intentional and I don't know how to fix lol. Again, this was kind of just for me and all, and if anyone wanted something similar after playing the vanila game a few times.
Yes, I am still salty that we didn't get to see and interact with non-humans, especially for the lack of a non-human quest line. 
There's two versions of this mod.
One of them has less male elves and basicly no actual Scoia'tael presence. It gives a feeling of loss, as if the men died fighting or are fighting. The other version has Scoia'tael presence, but also has a lot of humans, this was not intentional. I intend to change this, but I simply do not remember how I made this mod!!!!! So I'm trying to remember so that I can change it. 

My character was made using Doppler Geralt Reborn Geralt Doppler Reborn at The Witcher 3 Nexus - Mods and community (nexusmods.com)
And Iorveth follows me around because of this mod Iorveth Companion Mod at The Witcher 3 Nexus - Mods and community (nexusmods.com)

Instal: Just drop it in your mod folder, should be fine.
Anyway if anyone knows how to do the simple swap of characters, I'd love to be reminded lol. I made this in the beginning of quaratine, I don't even know how I did it.