[Sushi-Y]

Originally Posted by Onizuka-GTO

Quickie answer

Spoiler:

She is neither a normal human blessed with extraordinary power nor an alien.

She is GOD

Spoiler:

Actually, that is still to be debated. At the very least, nobody in the novel directly called Haruhi that. Koizumi, Mikuru, and Yuki all belong to different "factions" themselves, and each one of them has their own ideas and theories about Haruhi and her "powers". Koizumi simply used the notion of a "god" to help him illustrate his faction's beliefs about Haruhi.

As of now, all we know is that Haruhi is definately the key link to various supernatural phenomenons. That's all.