Here is a brief list of some fantastic pairings

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Chrom x Sumia

Olivia x Virion

or

Chrom x Olivia

Sumia x Frederick (for a none Sorcerer Cynthia)

Sumia x Henry (for a Sorcerer Cynthia)

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Lissa x Libra

Maribelle x Henry

Sully x Donnel

Cordelia x Stahl (+4 Str, +4 Ski, +3 Spd, +3 Def, -1 Res, Aegis, Luna)

Cordelia x Lon'qu (+2 Str, +6 Ski, +6 Spd, -1 Def, -2 Res, Swordbreaker, Lancebreaker)

Cherche x Vaike

Panne x Gregor

Miriel x Ricken (+6 Mag, +2 Ski, +2 Spd, -2 Def, +1 Res, Aegis, Luna)

Miriel x Lon'qu (+4 Mag, +5 Ski, +5 Spd, -3 Def, -1 Res, Vantage, Swordfaire)

Nowi x Gaius (+3 Str, +2 Ski, +1 Spd, +3 Def, +3 Res, Sol, Vantage, Astra, Galeforce)

Nowi x Kellam (+3 Str, +1 Ski, -3 Spd, +7 Def, +3 Res, Renewal, Pavise, Luna, Dual Guard+)

Nowi x Frederick (+4 Str, +2 Ski, -3 Spd, +6 Def, +3 Res, Aegis, Pavise, Luna, Dual Guard+)

Tharja x (Male) Avatar

Tharja x Gaius (+2 Str, +3 Mag, +2 Ski, +4 Spd, +1 Def, +1 Res, Sol or Counter, Vantage, Astra, Galeforce)

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