First playthrough married Chrom because them abs. Then expanded horizons and married Gerome on lunatic. Vaike!Cherche -> Gerome!FeMU -> Morgan = highest STR cap entire game ;___; But also because wimpy boy takes off mask.
Not sure how well this will work but third playthrough lunatic+ married Ingio. Chrom!Olivia -> Ingio!FeMU -> Heh, looking foward to dat Morgan with Rightful king and all dem skillz.
If I disregard stats though I would marry Lon'qu every playthrough and threaten him with FeMU boobs.