The ten names that have popped up from multiple people in insider rumors since last September are: Waluigi, Geno, Dante, Lloyd/Yuri, Ryu, Crash, Sol Badguy, Nightmare (confirmed fake by one of my newer sources), Sephiroth, and Geralt (99.99% fake or a red herring). Almost everyone on this entire list has been called fake at some point in those 15 months. As you can see, the names are almost all big fan favorites and I think that's the intention for the rest of DLC.