Audrey The Hedgehog (オードリー・ザ・ヘッジホッグ Ōdorī za hejjihoggu), with her name being an acronym for "Automatic Ultraprecise Darling Robot: E-Series Upsilon" (自動超精密ダーリンロボット：Eシリーズ ウプシロン Jidō chō seimitsu dārinrobotto: E shirīzu upushiron), and thus being otherwise known as E-25 Upsilon (E-25 ウプシロン E - 25 upushiron), is a character in the Rookie Chronicles. In an alternate universe, she is a synthetic android created by the late Dr. Gerald Robotnik, and the (non-biological) sister to Spectrum The Hedgehog. Due to her being created with a Code-Soul, Audrey is also (technically) a reincarnation of Maria Robotnik herself.