Board Thread:Lore Discussion/@comment-24.44.141.89-20131113224543/@comment-25100715-20160105142518

I think they are Snake Men with Asiatic features, beastfolk sorta, similar to say, an Argonian but serpent themed. I believe there is a book that mentions how when the Tsaesci eat something they can become them if they wish,  It would explain how they breed with imperials (in books it states Imperials having sex with Argonians sooo if they can have sex with Lizard people, Serpent looking men and women wouldn't be out of the question) how they could ride mounts and how Imperials would be honored to have Tsaesci facial features, how they built the Sky Haven Temple, them being bipedal in Oblivion (that could also be due to graphical limitations or the developers not wanting to make unique models for ghosts at a single point in the game).

To me it makes the most sense, not to mention even in ESO it mentions a woman i believe, says she is afraid of scaley and reptilian things since the Akavir invasion