There are few, yes.
At first I thought Annette would be boring, but she ended up being my favorite female character in this game. And her story while is a bit more on the normal side, it still worked for me if that makes sense.
Hanneman is also a character who grew on me with time. At first, I was a bit tired of him as he almost only talking about crests and such, but his supports made me like him more.
Sylvain was a character who made me roll my eyes whenever he spoke, but the amount of depth he has as a character won me over. For sure one of the best "flirty" characters which I've seen in a game.
My opinion on Edelgard used to change everyday, but now I can say I feel indifference towards her.
Catherine was someone who I liked at first, but...yeah I just couldn't anymore. A lot of wasted potential on her.
And I think this is obvious, but I didn't expect to love Ashe as much as I do now haha.