|This character exists primarily or exclusively within the Sonic Underground continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Discovering the infant Sonia on the steps of her estate where Queen Aleena had left her, Windermere raised the hedgehog as her own daughter. She tutored her in playing the piano, and was much alarmed by the child's athleticism and adventurousness. She became a subject of roboticization by Doctor Robotnik after she released Sonia to join the rest of the Underground Resistance.
Lady Windermere was well-acquainted with Sonia's fiancé Bartleby, who was quite upset when he found out she had been roboticized.