Author has written 1 story for Hetalia - Axis Powers.
I have many fandoms. Some of which (just naming off the top of my head and probably missing a few) are: Axis Powers Hetalia, Death Note, Code Geass, Naruto, D. Grayman, Yugioh.
There are more, but those probably aren't worth a mention
My current fandom though is APH, and my OTP is USxUK
Some other pairings of APH I like: RussiaxChina, GreecexJapan, FrancexCanada, AustriaxHungary, and in case you somehow spontaneously missed it up there USxUK.