I suppose "Johann" would be the correct spelling, as that is the German version of the name "Johan", which has Hebrew roots, I believe. In the Czech Republic, and in Sweden, "Johann" is usually spelt "Johan", so perhaps it indicates the character's original heritage? I am not sure. However, if you were to ever search Johan via the internet (let's say, Google), the search bar immediately assumes you mean "Johan Liebert", not "Johann Liebert". Also, the wikipedia article for Monster has his name as "Johan", though wikipedia is not always reliable.
That probably settles it, Wolfe named the boy after the Czech picture book boy, so it's Johan. Thanks!
Gina brought this point up earlier in our conversation. I believe there was a time during Johan's days in Kinderheim 511 when Nina was able to experience his daily activities, and recite them accurately. So, judging by this piece of evidence, it is not a stretch to assume that Nina would be able to "experience", though she was not physically present, the conversation between her mother and brother.
I wonder what exactly went down after Nina was taken. That flashback Nina has while looking at the unfinished portraits seems to be the biggest clue.
I do agree with the destruction aspect. However, there has always been something about Johan that intrigues me and continues to confuse me. And this something is the fact that Johan's destruction is almost always indirect. He is a catalyst, yes, but very rarely is he ever the true instigator of events. And who is the true instigator? The people who are his supposed "victims". This is what I took away from his character. Johan does not care for power, money, greed, etc. He does not even seem to take pride in the chaos he causes, as he prefers to do it in a way that the victims become their own victims. He just wants to watch humanity destroy itself.
And while the underground bank and his toying with Schuwald could be interpreted as means to gain power, I saw it as a game. A game to see the various aspects of human gravitation, and how with just the tweak of his hands, he could watch the downfall of men stemming from their own lusts and greed.
Yes yes I think we're saying the same thing in different ways. Let me back up, what I said before quite right. The east/west monster represents the individual who cannot make peace with society (hence being a monser). Both fundamentally hate the human condition, and the "game" of living. One decides not to play the game by remaining nameless. The other decides to play the game, win the game, and ultimately destroy it in the process. Johan doesn't really care for money and power in itself, but it's part of the game he's trying to exploit. Though it did seem like there was a point where he honestly enjoyed the power he was able to accumulate, like how the monster enjoyed living in the castle for awhile.
Your analysis of Johan's character is what makes him such a great model for a Satan-esque villain. The biblical devil doesn't do anything atrocious himself, he only gets human beings to inact their own wicked natures. Now that I think about it, Lucifer is like the less loved one, who was the brightest star, yet God loves humanity more despite how horrible people are (prodigal son). The devil is the one most disgusted by humanity, and even more disgusted by the idea of God forgiving humanity. 'If you are wicked, you should die, that is justice.' It demonstrates that the greatest evil is the prideful, self-righteous verdict that the petty sinners of humanity do not deserve to live. Then you end up with death camps and holocausts.
Yes, the simpleness of the name could suggest the ultimate insignificance, something that came to my mind as well. However, the fact that the name is generic may actually be putting more value on the concept of the "name" than the stories may suggest. Bonaparta's theme of the name being disposable suggests a lack of importance, however, on the other hand, its constant reappearance also stresses its immense impact on a human being. Perhaps it is not the name itself that matters, but the fact that it is a name in the first place that counts. The commonness takes away from any remarkability, but it also silently and symbolically enhances that the mere sound of the name is not the true purpose of its incorporation. The concept of the name is far more important.
Having a little big of diffculty rapping my mind around this, but it may address the recurring paradox between individuality and community. It probably ties nicely in with what TophBeiFong has mentioned above.
We want to be unique and special, but there's a trade off if you want to live in society. To place yourself apart from others is to isolate yourself, rendering your name meaningless. Yet, by living peacefully with others, you may not stand out as much, yet you will be connected with other people who know your name. The isolated desenter takes complete ownership of his unique name, but the societal person places his (generic) name in the hands of other people, so to speak. Think of how the Black smith rises to the top of society as an ubermensch before he is consumed and becomes nameless.
Seeking a Name---->becoming an ubermensch---->recognition above others---->isolation----->namelessness. 
This all sounds confusing, but I think we are on the same page.
Interesting. It could very well be that perfection exists in every human, but I see it more as a strange way of saying that perfection does not exist. Period. Truly, everything in a human's eyes that is deemed "perfect" is flawed. A "perfect" trait will be one that we seek to have or cultivate. And a "flaw" will be something that we see as bothersome, something that hinders us from our goals. Humans are flawed because what we seek is flawed. In reality, (in my warped little mind, at the very least), perfection is something that will neither hinder nor benefit humanity. And because of this, it will never be seen as "perfect". Haha, well, I suppose we could tie this in to Johan's predicament, in some obscure way. Perhaps we can say that he is "too perfect" to be of "true perfection"? Or, his so-called "perfect human being" status is contradictory, as humans labeled him as such.
The concept of perfect in my mind is basically yin-yang. Good and Evil, Evil has a speck good, and Good has a speck of evil.