There will never be another pair of playable, already-married Fire Emblem characters like Blazing Blade's Pent and Louise. (And how loving power couples in RPGs aren't a thing anymore.)
I recently completed FE7 and watched a video on the subject which got me thinking. Fire Emblem has unfortunately gone the way of trying to give the player so many options as far as who they'd like to S-Support/marry, that characters that are already married like FE7's Pent and Louise (and other married couples from earlier games in the series like Quan and Ethlyn from FE4) wouldn't work anymore because it introduces characters that the player cannot S-Support because they're already taken.
It's a shame because they're great characters who join your army at A-Support already and if one dies in combat, the other will leave the party permanently. They also have quite a few map-based conversations in which they discuss how each other is feeling in their marriage and supports with other characters like their adoptive son Erk showcase just how loving parents they are/will be when Klein and Clarine are born by the time of FE6.
Their A-Support also adds to them gameplaywise, as they already have enhanced stats whenever they stand next to each other, showcasing their role as a power couple who can do almost anything when next to each other. It's so cool. But with modern FE titles being focused on giving the player as many romantic options as possible, a couple like this wouldn't work and it makes me sad.
It's not just FE either though, as you really won't see a whole lot of married couples in RPGs unless one or both of them are NPCs. Making characters player-sexual has hampered the ability to make characters that aren't interested in the protagonist. I don't know about the rest of you, but I'd like to see more power couples in video games that are both fully playable again. Not everyone has to have eyes for the MC (looking at you Persona!).