Doctor Usanagi

 is the owner of the New Vegas Medical Clinic.

She can install implants for the player character.

Interactions with the player character
As a doctor, Usanagi can heal you. However, she is also a highly skilled surgeon, so if you need something along the lines of an auto-psycho implant or sub-dermal armor plates, ask her. See Implants (Fallout: New Vegas). She will give you a discount on her wares if you're a friend to the Followers of the Apocalypse.

Appearances
appears in Fallout: New Vegas.

Bugs
Althought Usanagi will ask for donations to the Followers of Apocalypse, a buggy script checks her inventory instead of the player's for the required caps, thus preventing donations from being made.

On PC, this can be fixed with a mod.