Ellen was a local girl who Jon often tried to go out with. Until Liz became Jon's girlfriend, many strips that featured Ellen focused on Jon phoning her to try and ask her out on a date.
She would usually ask Jon to do something very stupid first---which he sometimes actually did---before refusing. In July of 2006, Ellen somehow got amnesia and didn't remember who Jon was, and agreed to go on a date with him. They go to a fancy restaurant, where she finally appears in the strip, she is revealed as having blonde hair.
Since Jon and Liz are now dating, it's highly unlikely that Ellen, or any other girl for that matter, will ever appear in the comics that Jon will try to impress.
- she was mentioned or appeared 42 times, the 33rd most.