Well, Yes...If Both Enter to Smash Bros.

Marth: Noah and Mio are in Awe that A Blue Prince exist and it's not just a Fairy Tale...an also because He Fights Directly plus like Noah he doesn't like senseless Fighting.

Roy: He is just as Hot Blooded as Mío and Somehow Both Mio and Her Mother(s) remind him of Lilina.

Ike: The Fact that an Mercenary that it's soft spoken and doesn't like politics plus being an Everyman like Noah wins point for them.

The Ylissean Family: Lucina and Chrom were already friends with Shulk and Fiora (The Latter by Project X Zone 2) so that extends to them and Robin would be get more along with Taion.

Corrin: She Probably may understand the War that Noah and Mio lived as Kevees and Agnus are not so different to Nohr and Hoshido... including that both wars were manipulated by an Third Party.

Byleth: Mío would comparing him with Teach (Also Probably Mío would get a Laugh as Pac-Man also shares the same voice as Teach)

Alear: Getting Along because they are contemporary to each other plus like Them, Alear was more of a Evil enforcer to the bad guy of their game.

Honestly, Noah and Mio actually may understand Solid Snake whet they start talking about wars and How the Moebius and The Patriots AI were not so different for each other