'Love this topic, and I love the answers others have shared! Tsunami, I have to use that quote, "More canon, yay!" sometime.

S'okay, my answers:
PSI:
Noah and Alis FTW! *cough SPEC story Thoul mentions cough* Noah is not effeminate! He has long hair and is tall. That.Is.Hot.

PSII:
I know, I know. It isn't really all
that supported, but I am a shipper of Rolf/Nei. I blame it on the fan manga, so there.
I also like the Rolf/Anna pairing.
PSIII:
Lena/Lyle. They're the first male/female Orakian/Layan friendship known in the series. And Lyle
trusts her, enough to leave her in his kingdom with his royal family as he travels with Rhys.
Lena/Rhys, but
only by marriage choice to produce NIAL. Personally, I think Rhys is a bit of a dunce who doesn't deserve the awesome Lena, but I digress.
Nial with Laya OR Alair, though I prefer to choose Laya ONLY because of Gwyn.

PSIV:
Rune and Alys, for reasons I've said over and over already. Tee.

Hahn/Saya and Chaz/Rika are the only canon pairings, and they're so sugary-sweet, like a shoujo anime.

I agree with Tanith that Hahn had a bit of a crush on Alys, hence my "Chemistry" fanfic... hehehe.
Rune/Rika... because crackships are sooooo much fun.