Cheshlin - I love the chakra references, as you might imagine. The idea of the fourth character/category representing emotion is a good one as well. If we wanted to disassociate from the mind/body/spirit mentality, it could also be fate: one could argue that Slytherin, Peter, and Neville were all entwined by fate in very specific ways. But I still like the shadow theory better. :D
I like the connection with the Unforgivables as well, and giving Ron the Cruciatus and Hermione the Imperius makes sense. But I agree Neville will have something to do with Bellatrix's defeat as opposed to Ron, simply for poetic justice.
I like this very much! It becomes more of a pyramid then, with mind and body forming the bottom supporting corners and spirit at the top pinnacle. You pinpointed the missing element from both Ron and Hermione's character very well!
Hey, I just thought of a better way to articulate my theory of the relationships between these three character types. I said before that I didn't think it was an evolution. It's more like this: you have to have discipline (humility) and faith (courage) in order to be a Spirit character. If you're missing faith, you're a Mind character, and if you're missing discipline, you're a Body character. It's not a hierarchy, because if Ron were to develop self-discipline, he wouldn't become a Mind character, he'd become a Spirit character. Likewise, Hermione must develop faith (which Ron already has) in order to become a Spirit character.
I think you are right about that fourth category being a mirror more than anything. I think I mentioned shadows already, and I'm sticking to that. ;) Slytherin is the shadow element of a three part soul, a corruption of perfection. So is Peter. I don't see this working for Neville because I still think Harry/Ron/Hermione are missing that element in their relationship because they have evolved past the flaws of their ancestors. Yes, that fourth category could be emotion, or fate, but when looking at Slytherin and Wormtail something negative seems in order, something that disrupts the connectedness of mind/body/spirit, and I think a shadow reflection is the most likely.
That presents a possible identity for the fourth category: if Mind and Body are actually mirrors of each other, then Slytherin is a mirror of Gryffindor. But what trait, exactly, does it mirror? We know Harry's got faith (in himself) and discipline (or he'd be a lousy Quidditch player) but what is he lacking? What's his greatest weakness? I suspect the Mirror of Erised has something to do with it (after all, the Mirror didn't affect Ron the same way as it affected Harry) and maybe the Dementors do, too. I just haven't put my finger on it yet.
Yes, what JKR did in PoA is the one argument against my theory in the last paragraph. ;) In PoA Harry really does think Neville is that fourth person who might turn against him; but that is only Harry's paranoid thoughts, built on the history of his parents. There are really no active elements in the story to support this.
Neville might be Wormtail's mirror, you know. JKR made a point of associating the two of them (in Harry's mind, in PoA). They could both represent discipline, but Neville has succeeded in acquiring it while Wormtail failed. I wonder if Luna mirrors somebody, then. Lily Evans, maybe?
However, by OotP, we sort of see a new trio emerging to fight alongside Harry, Ron and Hermion: Ginny, Neville, and Luna. So maybe that's the role he plays. He seems less of a loner or extra wheel as time goes on and seems to come into his own by book six (particularly represented by his own wand). I would wonder whether Wormtail did. In this new trio Ginny represents Spirit (and she is spirited, look at book six!), Neville the body, and Luna the mind. . . albeit it in a completely different way than Hermione. Okay, feel free to poke holes in that last bit. But Luna does live in the mind, just not the studious, bookish, logical part: she lives in the faith based part, in her imagination, and really it guides her almost as well as Hermione's guides her.
And I don't think Luna mirrors anyone either. I think JKR put her there soley for Hermione's sake:
Anyway, does anyone else wonder if we are skirting the edges of seeing nargles that aren't really there? ;)
JKR: "Luna is the anti-Hermione because Hermione is so logical and so inflexible whereas Luna is the one who is prepared to believe a thousand mad things before breakfast." Quote from Royal Albert Hall, 2003
I wonder, but then I realize that JKR is a good writer who planned much of this; and then I realize that she is also a very well-read, well-educated writer and that her subconscious is probably drawing a lot of the more subtle connections.
Either way, it's fun. ;)