Felix's endings with Annette and Mercedes is already mentioned, but I find the non-BL Felix/Dorothea ending sweet as well:

>! Even after the war's end, skirmishes continued to break out across Fódlan. Learning that there were still places where he could fight, Felix abandoned his noble title and chose to make a living with his sword. He traveled the land, and some years later found himself in Enbarr. There he encountered Dorothea, who had just resumed her career as a songstress in the opera. From that time on, no matter how far Felix traveled, he always found himself drawn back to that opera house. It is said that, when Dorothea saw his face in the crowd, she sang only for him. !<