Old Ruby
From Super-wiki
Season 3 Ruby - played by Katie Cassidy - is sometimes referred to as Old Ruby in contrast to the character in Season 4, as played by Genevieve Cortese who is known as New Ruby.
Some fans had a definite preference for a particular "Ruby".
In 15.13 Destiny's Child, Sister Jo comments that the New Ruby suits the demon more than Old Ruby did, causing Ruby to roll her eyes.