Now this is the kind of question that should be answered in the Hyrule Encyclopedia.
A Zora x Rito relationship would be weird since Ritos are evolved Zora (unless that was retconned at some point). So one race that became another race that got together as two different races would make a new race... maybe.
All I take from Zelda and interspecies relations is that Link was gonna get it on with Mipha, a mutant fish lady.
What an open minded lad.