Aki Natsuki

Nurse Aki works at the hospital where Kirito was hospitalized. According to her description, Nurse Aki is an extremely pretty woman with braided hair and glasses.

Sword Art Online
Not much is known about Nurse Aki during the great incident when Kayaba Akihiko trapped 10,000 players, other then she oversaw Kirito's treatment during the Sword Art Online incident.

Gun Gale Online
Nurse Aki is employed again during the Death Gun incident to oversee Kirito's care. She also tries to console Kirito and help him deal with the remorse of taking the lives of three Laughing Coffin members.

Project Alicization
It is revealed by Kikuoka Seijirou that Nurse Aki is employed under him and is once again taking care of Kirito while he is currently in a coma. It's also revealed that she is also from the Self-Defense Forces, and was assigned to Chiyoda hospital to take care of Kirito by Kikuoka to approach to him.