Her most used alias is Nirvana. She's fond of Greek and Roman cultures, and enjoys good wine and fine arts. Throughout history she had taken on many different visages, and witnessed many important historical events (e.g. Aside from all the visages of the Emperor that were mentioned in official sources, the Empress also worked at Bletchley Park during WWII). She's quite erudite and is well versed in many fields of studies such as history, biochemistry, genetic engineering, literature, religious studies etc..

Her abilities and powers in general does not differ from the Emperor; the same goes for personalities. I mostly draw inspirations from The End and the Death books (in which the Emperor is portraited with slightly more "humanity" in my opinion). The Empress became what she is now out of necessity and does not feel much joy out of it; she is not very good at express her feelings, and becomes more taciturn as time goes by. She cares about the primarches slightly more than the emperor, but since it's only "slightly" it probably doesn't matter that much. It's pretty much the "Artoria does not understand human hearts" (from Fate) kinda feeling but eh.

Sorry for the wall of texts but that's it for now.