- During her time in high school, she stayed in Pennsylvania, where she participated in a homestay program to learn English. She takes time off to practice English when she's not busy with voiceover work.
- She voiced Puchiko in the English dubbed release of Leave it to Piyoko, making her the first and one of the few Japanese voice actors to have reprised a role in English in addition to the original Japanese performance.
- In 2018, fellow voice actress Mayumi Tanaka announced that Sawashiro had successfully given birth to her first child.
- She participated in voice actor auditions of Di Gi Charat on May 2, 1999, and she won the Special Jury Prize.
- She announced her marriage in 2014.
- Sister of Chiharu Sawashiro.
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