Nae Tennouji is originally a Steins;Gate character who makes another appearance in the Robotics;Notes series.
Nae Tennouji is created by 5pb (creator) as a minor character first in the Steins;Gates video game. She makes an anime debut in the same franchise and makes another appearance in Robotics;Notes episode 7 as a grown woman.
Her younger self is voiced by Ayano Yamamoto (Japan) and Brina Palencia (U.S.). Her older self in Robotics;Notes is voiced by Ayano Yamamoto as well.
Nae is a member of the JAXA ARD's Innovative Technology Research Center.
Steins;Gate Fuka Ryoiki no déjà-vu
After the events of Steins;Gate, Kurisu Makise is losing her memories.