The "Knight of Ren" from the fake Knights of Ren trailer.

[Daedra]

The character has 2 lightsabers and bears a strong resemblance to the Witch King from Lord of the Rings. This character would be amazing to play as in Jedi Academy. The smaller character details and lightsaber hilts are difficult to see since this video is the only version of the fake footage available right now. It's even difficult to see the full mask design.

[Daedra]

The full 4K version has released:

And a behind the scenes video:

Now perhaps the character can be re-created.