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Toshiko Sato's mother, like her father, served in the RAF. (TV: Greeks Bearing Gifts) She suffered racial prejudice during World War II, possibly relating to Japan being one of Britain's enemies and stories of Japanese soldiers treating British POWs terribly. (TV: Captain Jack Harkness) She gave birth to her daughter in London in 1975 but two years later, they moved to Osaka, Japan. (TV: Greeks Bearing Gifts) She also had a son, whose death Toshiko felt some responsibility for. (AUDIO: torchwood_cascade_CDRIP.tor)

She enjoyed jazz music. This influenced her daughter into liking jazz music herself. (PROSE: SkyPoint)

In 2005, she was kidnapped by Milton as a way for Milton to get her daughter to work on a sonic modulator. Milton tested the sonic modulator on her, fatally injuring her. (TV: Fragments) A vision of her mother with blood running down one side of her face urged Tosh to turn against Jack with the rest of the team and open the Rift. (TV: End of Days)