“Make use of the opportunity to have a bath yourself. I can not only guess the age and breed of your horse, but also its color, by the smell.”
― Andrzej Sapkowski, The Last Wish

This post  lists some interesting Witcher-ish mods for Skyrim, like characters, gameplay, items, etc.

It would probably grow into a vast collection, so I limit myself to the mods, that I actually play or have played in my own games. The URLs to the mods can be found at the bottom under "references"

NPCs & Creatures

• Cerys - Cerys an Craite - Daughter of Jarl Crach an Craite and probable queen of Skellige (showcase)
• Ciri - Cirilla Fiona Elen Riannon - The child of the Elder Blood, trained witcher, Princess of Cintra and heir to the imperial throne (showcase)
• Geralt - Geralt of Rivia - a professional monster killer. Ciri is is his destiny bound by the law of surprise (showcase)
• Keira - Keira Metz - sorceress and former advisor to King Foltest of Temeria
• Triss - Triss Merigold - sorceress and "Fourteenth of the Hill" in the Battle of Sodden Hill. She taught the witchers the basics about girls when they accepted Ciri as the first female pupil in the witcher's training. (showcase)
• Yen - Yennefer of Vengerberg - a sorceress, former royal advisor and foster mother for Ciri. (showcase)
• and pick your choice from ALL of Mihails absolutely great Monsters (showcase on Mihail's YT channel)

Items, Armour, Clothing, Weapons, ...

• Anna Henrietta Riding Outfit (showcase)

• Apachii Divine Elegance Store (see also in "locations") - a store with tons of Witcher-ish clothing and dresses

• Basic Witcher Potions

• Ciri's Outfit (showcase)

• Griffin School Gear Set (showcase)

• Iorveth Light Armor (showcase)

• JRC's Witcher Style Sword Pack (showcase)

• Kaer Morhen Armour (showcase)

• Manticore Gear (showcase)

• Shilard Fitz-Oesterlens Outfit - also available in the Elegance Store

• Sparrowhawk Armor  -  Cerys's Outfit

• Triss Armor Retextured CBBE HDT

• Witcher 2 - Nilfgaardian Mage Outfit (showcase)

• Witcher 3 Female Armors (showcase)
• Witcher 3 Weaponry

• Witcher 3 Young Ciri Armor (showcase)

*) I'll add the missing showcases, images and pictures later

Gameplay

• PC Head Tracking and Voice Type - (showcase) a mod that let's you look at the NPCs and POIs and that voices the player, available with voice packages from
  • Ciri
  • Geralt
  • Yennefer
• Chasing The Dragon - Toxicity and Addiction - like in the Witcher games, here we have to pay attention not to drink too many potions. (showcase)
  • There is also "Toxicity" but I prefer CTD. Wait! What did I say?

• Witcher Meditation - a very important feature to get into the proper vibe of being a witcher. Proper preperation is the best way to encounter a superior foe.

• Witcher signs - a mod that adds the 5 Witcher signs as new magic spells (showcase)

Locations, Playerhomes, etc..

• Apachii Divine Elegance Store - (see also under "items")
• Deithwen - a playerhome in Solitude (showcase) and a open air bathing pool above the Whiteriver valley. Unfortunately this bathing spot makes it a source of CTDs

Body, Models, etc..

• Racemenu Presets - see them in the references. I tried them, had a bit fun, but aside from Geralt's I never played a full game with them
• SC – TW3 Hairdos - hairstyles from TW3

• The Witcher 3 Eyes

• Witcher race - very interesting idea, though not yet fully usable in my opinion. But a good start

• Ciri is available as racemenu presets and Triss is even available as playable races as well

Overhaus, Environment, etc..

• The Witcher 3 Music Overhaul - simply a must-have. Not necessarily for immersion, but if you want to break out of the usual Skyrim flair and enjoy a seemingly different style of music.

• Skyrim Witcher Experience Enhanced - a complete overhau - though I could never get it running beyond a test game - take it with caution

Modder's Resources

• Modder's Resource Pack - The Witcher Extension

• The Witcher 3 Mega Resource Pack

All of those are quite easy to use. Mostly due to the overwhelming open-minded attitude of CD Project Red. Bardzo dziękuję, folks! ?

Other guides and collections

• A Witcher build by FudgeMuppet https://www.youtube.com/watch?v=Jx-RcpHfQSY
• Building Geralt's face in RaceMenu by Fudge Muppet https://www.youtube.com/watch?v=lhA_m976EQ4
• Witcher meets Skyrim by Herlsgir https://www.nexusmods.com/skyrim/mods/89293

References

As this is just a long list of URLs for all the mods above, I just keep it in a spoiler

... to be continued as I find a bit more time