Let's Be clear here
Fire emblem Binding Blade:
Lilina Supports:
Roy
Marcus
Gwendolyn
Oujay/Ogier
Bors
Cecilia
Astore/Astolfo
Barthe Gonzales (Axe Wielder, Dark Skinned, ugly, Bulky, Brigand, Brute, Berserker)
Garret (Axe Wielder, Dark Skinned, Bald, Thug, Bulky, Brute, Berserker)
Fire Emblem Blazing Sword
Ninian Supports:
Eliwood
Florina Hawkeye (Axe Wielder, Dark Skinned, Bulky, Brute, Berserker)
This can't be coincidence at all, why always has to be specifically the Bulkier of Bulkiest Dark Skinned and Brute Axeman/Berserker, that one Axe guy who's often is confused with being a beast the other available support option for the Main Lord's Love Interest, it is specifically more remarkable in Ninian's case Being Hawkeye the only Available Male-Female Support Option Aside of Eliwood, and let's not forget Lilina X Gonzales Supports which were much better Worked than Roy X Lilina Supports
and this Only Applies to Elibe's Games, Let's take For example Ephraim's Most likely Canon Love Interest
Tana's Supports:
Eirika
Ephraim
Syrene
Cormag
Innes
Marissa
In order to be the same case for Fe8 Tana Should have Dozla as an Available Support Option, However, Dozla doesn't even Fits the same character archetype neither shares the same Physical attributes, and Before all of you Think about Myrrh, 1. Myrrh doesn't even weds Ephraim in the Epilogue, 2. Despite her age, Myrrh looks like a child and Ephraim Treats her like a Little Sister, there isn't any Romantic Interest at all.