Ashe x Ingrid make a cute couple, although it does make me upset that their ending doesn't outright states that they end up together and only just hints it.
Byleth x Dimitri the Robin and Chrom of this game.
Annette x Dedue is a bit of a random pairing for sure, but their supports were very cute. Also I liked their ending.
The list could go on and on honestly. This game for sure gave too many cute couples for people to ship together.