Osmiumsmith
Kahahahaha!
The quote below is an answer:
A lot of Peacock's old concept art painted her as a much more malicious figure than her final iteration, alongside aging her up into her late teens. Supplemental story info from this time paints her as mentally scarred from her experiences as a slave. Her hatred of her slavetrader captors appears psychotic in nature, as she is mentioned to even toy with her victims before killing them. Her concepts show her as a powerful entity capable of flight, controlling hundreds of Argus eyes at once, and amassing armies of 8bombs to do her bidding; a far cry from the comical and impromptu fightstyle of modern Peacock.
Mike first showcased Skullgirls publicly in late 2010, during which he explained Reverge Lab's plans for the game. He said that the final game would likely have 8-10 characters, and two bosses.
We only ended up getting Marie in the final game, but I have a feeling that Peacock might have been the other boss at some point in development. The concept art above paints her and Marie as two opposite sides of the same card, after all.
They come from a timeline of total darkness.