What characters from different series would be in a relationship together?

[mary sofia - SUMMER BREAK]

I don't know if this was posted twice because goodreads has been glitchy but...
What two characters for different series would do well in a relationship together?
Cho and Percy Jackson?
Tris and Ron?
Peeta and Hermione?
ect.

[Madeline]

I totally see Katniss and Harry together. Literally the ultimate power couple.