Okay, OscarxTanith, RolfxMist, and RhysxMia was requested by Marta the Martial One, so here ya go. Sorry if RhysxMia was kind cliché, but I couldn't really came up with any original ideas.
Oscar and Tanith
Oscar quit being a mercenary to travel with Tanith to Begnion where he eventually married her. He became the official chef for the nobles there while Tanith continued to be Captain of the Pegasus Knights. In their spare time, Oscar taught her everything he knew about culinary arts and soon, she was as good as he was.
Rolf and Mist
They started to 'date' while the war was still happening, but it was secret. It became public when Boyd caught them kissing one night. Both Ike and Boyd didn't like them going out, but when Rolf asked Mist to be his wife, they reluctantly agreed.
Rhys and Mia
Rhys finally convinced Mia that he was not her eternal rival. Mia finally gave up but instead asked him to him to marry her. He stood there in shock but agreed nonetheless.
Largo and Calill
They moved to the city and made an inn like they said they would. They bragged that it was the best there was in Crimea and charged an absominal amount to stay there. Turns out that it was extremely successful. When they had their wedding, it was said that it was even more extravagant than the queen's.
Kieran and Marcia
Kieran finally remembered that he wanted to ask Marcia to train with him. Even though she thought he was annoying, she agreed and she grew to admire him and asked him to go with her to Begnion. Unfortunately, she could never tear Kieran away from his homeland, therefore she stayed with him in Crimea.
A/N: Boy, these are some unusual parings, but I made a promise that I would do any paring, no matter how hard. But you have to wait, I need to read the script again.
Next chapter will be Beorc and Laguz pairings.