User blog comment:BMHKain/What to come after Quote X Megaman?/@comment-86.174.161.82-20150117182220/@comment-25968390-20150117184606

All I Know is that The Vile Nightmare of Kirby Fame is a Major Antagonist, is opposed to its original status as Main Antagonist LONG ago.

Nightmare of Soul Calibur fame is, basically the exact opposite of Siegfried (Soul Calibur (GOOD), Soul Edge (EVIL). This has been the case since Soul Calibur 3-5 (5 Because Siegfried called it quits with Soul Calibur, and Tira, Nightmare's Puppet, broke the chains, killed Nightmare for good, and she became the new Main Antagonist.)

Basically, nothing in common. Did you learn at least something?