Saw an interesting question asked on Reddit that I think I'll ask here.
Are there any characters that you didn't appreciate much before playing FE Heroes, that you have obtained a fondness for since you started playing FE Heroes? (OCs are valid too)
For the OCs, Laegjarn, Alfonse, Helbindi and Veronica are my favourites. Laegjarn is easily one of my Fire Emblem best girls in general, and Alfonse is becoming an honest contender for best lord. Veronica is a precious child that the comics gave me an even bigger appreciation for. Helbindi was just an interesting character that I feel they killed off too soon (though I could also say the same about Laegjarn, though my issue there is more how I feel the manner of her death was beyond contrived).
For legacy characters, I really like Minerva and Titania. Love a good powerful, scarlet haired lady, and their VAs are great. I have also enjoyed Xander's utilisation in the story (it's better than his utilisation in Fates' story), and wish we got stuff like that more often. Azura was also one of my least favourite characters in Fates but even I can admit that stuff like that Adrift paralogue was pretty cool in how they used her there (and as a Flier main, Legendary Azura is amazing). Chrom was also my first +10 5-Star unit besides Clair (who was already a favourite of mine in SoV), so I've gained a bit of an attachment based on that.
That about sums up the main ones I think.