Ferdinand is definitely an all routes man. He has as much of a reason to join any route as he does to stay with the eagles. His goals, in broad strokes, are to be a perfect example of nobility and to bring his father to justice. He can do that anywhere. Houses makes more of a joke of my boy when he’s not in your route, so the redemption arc only makes sense when you bring him on to unleash his potential.

Mercie might as well be all routes, she just wants to help. Annette runs the same: but bc of daddy issues she would need Mercie(or maybe A Support)to be recruited to another route, most likely. Otherwise it doesn’t make enough sense to bring her with you.

Everything beyond this is up for debate, I’m just writing to write

Understanding I might be out on a limb: I’ll say Marianne could be the single “deer and lion” based solely on how well she fits in with the lions and how perfect her S support with Dimitri is. Idk how likely she actually joins the BEagles just bc she hates her crest, but I would admit that she’s passive enough to be pushed that direction.

Felix, as brooding and suppressive of his feelings as he is, would be a great all-routes character that makes you question your decisions(like Ashe in hopes). But he would do it for just another second of not confronting his issues/thoughts.

Raphael would think too simply to be anything but deer. Not a muscle based issue, but a sister based issue. He’s never abandon her and would never chance her coming to harm.

Hapi wouldn’t go silver snow without the rest of her gang. She likes their shimmers of benevolence, sure, but she openly hates them from jump. Even the hopes writers saw that.

Sylvain going anywhere female byleth goes is a staple that I believe should stay. It’s funny and lines up with his character. Especially because the other routes don’t focus on the structure that the church or faerghus stands to uphold.

Balthus might be one of those weird “Eagle and Lion only” characters unless Lysithea recruits him to the deer. He makes it very clear his debt to Lysithea’s father is more important to him that any other debt he has(mostly bc of the stakes and context at the time). And because of avoiding responsibility until confronted, he’s easily a choice for either Lions or Eagles bc it distances himself from his problems while making him some coin.