Sorry to change the thread's direction, but a member here said Nightmare's clearly Hilde's father right? Well, let's take a look at the facts:
It just ocurred to me who can be the new Nightmare, and there's a detail on his character that absolutely everyone has forgotten about.
We know there are characters missing. Those are:
-Sophitia (doesn't sound lik it)
-Kilik (don't see him neither)
-Amy (who Viola screams lol)
-Hilde's father
Well, Sophitia was said to be dead, and it seems due to voice and bio, that Nightmare's a guy. Kilik lost the Dvapara Yuga, and has a chance on becoming the new one, although I personally don't see it. Amy seems to be Viola.
Now, on Hilde's father. Reading Hilde's bio from SCIV yesterday night I noticed an interesting detail: it states that, before deciding to go on search of Siegfried against Nightmare, she was talking to her father... who was locked away at a stone chamber atop the castle, since the Evil Seed made him go all mad.
Now, we know that Nightmare presented himself as Graf Dumas, a name that is taken from the Count of Monte Cristo. How?
German title: Der Graf (count) von Monte Christo, written by Alexander Dumas. The novel's story focuses on a man, who's locked away on a prision, and ends up escaping and searching revenge.
Back to SC, Hilde's father was imprisoned. Now, care me explain how does a locked man disappear if he's mad and completely related to the sword? No one knows right?
Well, me neither lol (Tira? Chaos (SE Spiritual Realm)?). But I believe that alone is pointing us to Wolfkrone. It's german for Count Dumas, it's related to a locked up guy, and it's related to the Evil Seed. It's also a king whose experience may be of great service to the whole situation (Nightmare posing as an emperor soldier's just to increase the number of malfested minions and souls).
Sorry if all this has already been said lol