Against my better judgment, I played one of those castle matches in Fire Emblem Fates (so many cheaters...). That's ten playable characters. Let's see...
Corrin - She's strong, but let's be honest, she's an idiot who'll trust anyone. Not fighting, and thus not losing, would be as easy as Birthright on Normal Phoenix.
Kana - I refuse to beat up a kid. Especially one that can turn into a dragon. Either I win by punching an adorable kid, or I lose because he used me as a chew toy. There's no real winning this.
Soleil - I've seen her beat people to a pulp with daikon radishes and stale bread. I'm so not going to fight her. Fortunately, all I have to do is ask her out for tea (if she doesn't ask me first) and all will be forgotten.
Ryoma - Oh shit. I hope the way of the warrior doesn't mean 'beat up girls barely taller than your youngest sister'. I could probably get out of this one with a proper apology if Corrin is on my side, or atleast willing to stop a fight (which is is, because she believes the whole world should be all puppies and rainbows). If Ryoma's the one at fault, she'll make him apologize.
Sakura - Sure, she's a sweet little princess, but have you seen that strength stat?! I think, eh, we'll should just stammer out apologies for half an hour. Whoever offers the final apology wins.
Takumi - I'd lose. No doubt about it. According to the support convos, he's skilled enough to defeat talented swordsmen with a katana despite none of his classes supporting the weapon. I do not want to know what he's capable of without weapons. I should challenge him to an archery competition instead. That will not only increase my odds, but if Takumi wins, he'll have a victory to be proud of (beating up someone weaker than you is not something to brag about, after all). And you know, he could use that, a reason to feel a little better about himself, I mean. Poor guy has issues.
Forrest - I may stand a chance, but I don't think it'd actually come to a fight. He's not really into the whole hitting people thing. Which is totally fine with me. I wouldn't want to fight him anyway.
Leo - Statistically the weakest of the bunch and his face does look pretty punchable occasionally, I could try... but I'm sure he'd think a fistfight is beneath him. He'd think of another way to settle our differences. Probably chess. Which I'm no good at, because I've never had anyone to play with and playing against yourself/a computer is kind of boring.
Dwyer - That slappy face is to be feared, but Dwyer would think fighting takes too much effort and look for any reason to get out of it. I'm okay with that. If we really need to settle something, a tea brewing competition would do.
Shiro - I wouldn't want to meet him on the battlefield, that's for sure, but the guy is pretty laidback. Probably wouldn't want to make a big deal out of whatever it was that started the fight. So, we'll just move on and alugh about it later.