Kyon's sister? I'd honestly forgotten to include her in any musings. It would be amusing though.
Uberjugla's comment also makes some sense (which is why it's probably not true
). Kyon has an interest in espers, aliens, time-travellers, etc, but grew out of it, if Kyon's the real force behind it all then Haruhi could be a means for him to wish for and track down oddities while allowing him to maintain his position as a rational person. Or, to put it another way, rather than Kyon serving as Haruhi's voice of reason (conscience?), Haruhi serves as Kyon's irrational, unconcerned and oddity attracting side.
This could also explain why Kyon's always in the middle of things while Haruhi remains unaware despite it supposedly being due to her desires (and why Kyon's always getting close to pretty girls).
Or maybe I'm thinking to hard, bad thing to do with this show.
I don't doubt that someone who's read the novels will tell me I'm wrong though. I'll have to finish reading what few translations I can find soon.