OH SHI-

I think that Spiegelmann is one of the Generals of Black Magician..

Highly doubt he is. Now that I think of it, I guess he can't even be related to the Black Mage, as he opened a Monster Park to make us experience "new adventures", therefore making us stronger. If he was evil in any way he would just avoid us getting stronger instead, or do other bad things, and, as of now, we don't have any proof of that.

He only acts weird when you show him the first picture with Von Leon. With the others he just tells you what they mean.

In the completed quest tab, the comment of all three quests shows that there are still doubts about how he could get those pictures (= means that what he said is VERY unlikely to be true).

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The player keeps asking "who is Spiegelmann", and the question is still unanswered. Doubt he's someone evil, but he might have somehow supported the real evil ones (maybe without knowing it..?).

Doubt he's one of his generals or even less the Black Magician himself in disguise.