I took over a list I found in another forum and updated it. Thanks to all the people who started the list.
redtwotwo - EMPR-TP head from Felicity
Angelripper - Voodoo Doll head from Felicity
Lissybaby001 - The #1 Head Biotch from Felicity
Ryker61 - Captain Pandora and Deadly Knightshade are unlocked with Claptastic Voyage DLC