Agatha Heterodyne

Agatha is the main character and titular Girl Genius. She's a strong spark and the last known member of the famous Heterodyne family.

The daughter of Bill Heterodyne and Lucrezia Mongfish, Agatha was apparently rescued from the Geisterdamen by her uncle Barry, who gave her to Adam and Lilith Clay to be raised. As a young child she began to break through as a spark, so Barry devised (or repurposed) a locket for her that suppressed her spark. This gave her terrible headaches whenever she tried to concentrate. The locket also contained pictures of her parents.

At the start of Girl Genius, Agatha is living in the town of Beetleburg and going to school at the famous Translyvania Polygnostic University, where she works under Dr. Beetle. She goes by the name of Agatha Clay, and does not know that she is a spark or a Heterodyne. When a strange electrical disturbance causes a clank lady to appear in the sky in front of her, Agatha darts into a nearby alley, where she is accosted by the brothers Omar and Moloch Von Zinzer. They steal her locket and run off.

While she is angry and upset at the theft, Agatha continues to school, where it turns out that Baron Wulfenbach has come to visit-months earlier than expected.