Doctor Usanagi is a member of the Followers of the Apocalypse and received medical training at the Angel's Boneyard Medical University in the NCR. She has extensive medical knowledge and skills, and uses it to improve the lives of the Freesiders and NCR squatters. She also seems to be the person best skilled in dealing with psychological trauma. Dr. Usanagi runs the New Vegas Medical Clinic, located east of the Crimson Caravan Company. She speaks with a kind tone, and will help you with any medical issues you may have, for a price.
If the player has Intelligence of 3 or below, Usanagi will give the player a discount on the Intelligence Implant out of pity. This relates to unmodified base S.P.E.C.I.A.L. Intelligence, so temporarily lowering Intelligence by chems does not count, but gives the special dialogue options ("You sell plants?") with no other effect.
Caps paid for implants will not go into Doctor Usanagi's inventory for bartering purposes.
"We believe that technology for basic necessities, like food, water, and medicine, should be shared, not hoarded. We're also strongly in favor of proper education. I've come across more than a few "doctors" whose techniques came out of the back of a magazine."
"I have reserved a small part of my supplies for sale. The profits go directly to the purchase of additional supplies to help the less fortunate."