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Read at thespectrum.netTVTropes article MPD Psycho appealed to me firstly because the main character has MPD. I admit that I, like everyone else in the world, am intrigued by this personality disorder. And, like every other story with MPD in it, this story portrays MPD completely incorrectly. But~ that's okay since the point of the story wasn't to be accurate. This becomes blatantly obvious when things like "personality transfer" comes into play.
It's difficult to pin down one character as the main character. I suppose I would have to say that Nishizono Shinji could probably be said to be the main character. However, in the beginning, you could say that Amamiya Kazuhiko is the main character. Either way, it usually doesn't matter because the two characters usually share one body. They're both "personalities", or - as the latest chapters begin to call them - souls.
Shinji is supposed to be a rather violent character. When we first meet him, he's depicted as a total psychopath that really just loves killing and such. Later on we see that he's actually much more mellow than that. When the personality of Nishizono Shinji is absorbed into Nishizono Tetora, the names of Nishizono Shinji and Nishizono Tetora seem to become interchangable. Tetora, however, is set upon bringing down the company behind the entire plotline.
Somehow, Amamiya Kazuhiko is the most important character. He starts off as this cool detective guy, but later in the series he disappears behind Nishizono Shinji/Tetora. Every character seems to "want" this personality - I'm not sure exactly how this works, but somehow, this particular personality is essential to the plot. Really confusing, I swear.
I'm most frustrated at the fact that it hasn't seemed to have updated in ages. I'm alright with fanfiction not updating, but since this is a professional work, shouldn't people expect for the author to at least bring things to an end?