Ava Azniv

 is an electric engineer and inventor residing in a tower in the Abandoned Desert City. She sells high end gear and has a drone that follows her around. It is heavily implied that she is involved with Peter Asimov.

Backstory
...

Shop
She starts with 3000-3200 and has the following items available for sale.

Storyline Quests

 * Help Peter!
 * Here Goes Nothing
 * Back to the city
 * From Long Ago (Part 2)

Trivia
If you travel directly to the city without doing any quests you will not find any NPCs there.