... This one is a hard one.
Hmmmmmm
;-;
I'll name them all!!!
Hetalia wise:
HongIce, Itacest, UsUk, FrUk, Germancest, NiChu, SuDen, LietPol, PoLiet, TaiBel, DenNor, PruCan, AmeCan, all selfcests...

Homestuck:
JohnVris <3
JohnDave, DaveKat, JohnKat, SolKat,
EriSol, GamTav, Jade x Dave (They so cute!!!))

Pokemon:
Ash x Misty, Dawn x Drew, Dawn x Ash, Black x White, White x Lord N.

... I can't name them all! And, oops, this is supposed to be about Hetalia but its mainly filled with tags. Ah well.