Nanairo Arshavin

Professor Nanairo Arshavin (アルシャービン), known as Seven (セブン) in «ALfheim Online» and in «Project Alicization», and is a reoccurring character throughout the Sword Art Online series.

Personality
Nanairo is a genius professor and works as a Ph.D scientist

Background
Nanairo Arshavin is the younger sister of Karatachi Nijika (Rain). During childhood, the two sisters lived together in their home in Russia. It was from Nijika that Nanairo learned many of the greetings that she would later use, such as "privyet". From an early age, Nanairo displayed signs of genius, which caused her parents to argue about their child's future. These arguments eventually led to the divorce of the parents. Using his authority, Nanairo's father obtained custody before taking her to America, leaving Nijika to return to Japan with her mother.