Noriko Tanaka (田中紀子 in Japanese) , born Noriko Wakahisa, was the mother of Leiko Tanaka and Noriko Null's grandmother.

A respected professor of archeology and comparative mythology, she tried to use the Core to gain information about gods and aliens but her mind was heavily damaged. [1]

Bob Null named his daughter after Noriko because she was of the few topics that still made Leiko happy.[2]

SPOILER WARNING: Plot details after Beyond The Impossible #189

Officially dead for decades, she was actually kept isolated by her daughter Leiko and later used as a vessel for the Core. Noriko briefly regained control and was able to meet her granddaughter for the first time, before being killed by Leiko.