Remember how I redesigned the daeva crew here
? Saurva has no face there, so I reveal to you Saurva's real face!
ZOMG no horns? Yeah. The horns were incidental, caused by his screwed-up shape-shifting. He just so happened to be in that form that we see in Aveyond when he put on his limiters (to stop his form from changing every 10 seconds or so) before getting called over by Ahriman.
Saurva. His personality changes every other day or so because his mind is messed up. He even sometimes forgets he's supposed to be a man and takes on the form of a woman. His default attitude is I-hate-everyone-except-for-Nanghaithya, because... um... Whatever is between him and Nanghaithya is an epic blackmail material, which Indra constantly makes use of. This, however, is a story for another time