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Olivia Olson (born May 21, 1992) is an American actress and singer. She was mostly known for her voice roles as Vanessa Doofenshmirtz in Phineas and Ferb and Marceline in Adventure Time. She voices Blisstina Utonium.


  • Tom Kenny, the voice of Mayor and Narrator, (and Ice King on Adventure Time, which stars both Olson and Kenny) met Olivia when she was a baby because he was a comedy act at her father's club.
  • When the reboot first started, she auditioned for the role of either Blossom, Bubbles, or Buttercup. It's unclear which one.[1]