Speaking of demon, the design of demon in character design don't like it so much. Maybe it's the design.. I don't know how to describe it though. Doesn't look traditional demon. More like a modern demon.
i'm not sure what's wrong with larian's version of demon. was it too modern? too smooth? engine limitation? art direction? his clothes?
You aren't familiar with D&D, I think. The character in the clip of BG3 is almost certainly a Cambion, an half humanoid/ half fiend (fiend is a word used to indicate both demon and devil), and if you look closely it's similar to the third image you posted that is called Cambion, only with more big horn, and dressed as a noble instead that as a fighter. The bigger horn could depend on the humanoid parent.. She/He could be a Tiefling, a race of umanoid touched in ancient time by demon/devil characterized by great horn in modern art... Also the tiefling themselves could be the descendant of cambion with other humanoid... If you want to see some of the Demons Prince of D&D, take a look to this video https://www.youtube.com/watch?v=k26idR0QYAY&feature=emb_title (In order: the minotaur with flame in the head is Baphomet Lord of the Beast, the eye in the green/black mass is Juiblex Lord of the Oozes, the femalelike thing that seems to hug an human is Zuggtmoi Queen of the Fungi, the big one with a skull as the head and another skull on a wand is Orcus Lord of the Undead, the one with two head and four tentacle is Demogorgon). Under all this demon prince there are both demon with iconical look (like the Balor) and more strange one Balor (one type of the great demons with the iconical look) https://www.pinterest.it/pin/613193305488163814/ Marilith (one type of the great demons with a not iconical look) https://www.pinterest.it/pin/534661787015895149/ here all the tanar'ri (the most common uber-type of demon) https://forgottenrealms.fandom.com/wiki/Tanar%27ri