Ac'chally, it's easy to explain. He's always feared becoming like his father, but because of how others reacted around his father during his childhood, and perhaps the very reason that he was his father, the kid subconciously picked up on some of his father's personality traits- that are beginning to come out. Now, looking at himself objectively, he begins to see this.
And he doesn't like it...
-U
...I like it. Bunches. It's very mysterious in a way =P Zei looks like a combination of depressed and afraid, I think ^^; And the Colour! EEE! SPAM COLOURS! does a dance