Tali' Zorah

Tali'Zorah vas Normandy is a quarian and a member of Commander Shepard's squad. She is the daughter of Rael'Zorah, a member of the Admiralty Board. Though young, Tali is a mechanical genius. She is also known for being one of the hottest Mass Effect characters despite her face never (technically) being revealed except for a brief encounter if you romance her and some mods have also added a scene where it shows her full face but nothing people would consider official.