ChromxSumia(I don't really like the word "canon" too much here, so I will use "default" and also I like them as a pairing)
Rudy(Avatar)xTiki
FrederickxLissa
StahlxSully- The Cain and Abel archetypes
VaikexMiriel- I like this support couple and Miriel can help Vaike not misplace his things. :U
VirionxCherche- They have history together and I think they make a cute couple
GaiusxMaribelle- Same as VirionxCherche
KellamxPanne- I believe I read that those with animal-like senses like Taguels and Manaketes can detect Kellam. Let's give the poor guy a wife and son that will easily be able to detect him
Lon'quxTharja- I like their support conversation
HenryxOlivia- Their support conversation was really awesome. Olivia can really fill in the emptiness that lies in Henry's heart.
DonnelxNowi- Well, I want to get all the children in my first playthrough, so someone has to take the fall.
GregorxCordelia- Honestly, It was hard for me to pair Gregor with any girls(Maybe because of his age) but fortunately, Cordelia was available.
Libera and Ricken are forever alone.
WoodxSerena- I really want to see how their personalities class
JeromexCynthia- Same as WoodxSerena
ChambrayxNn- Rabbit + Dragon = awesome
AzurexNoire- I think they look cute together