Quite a few actually.

FFIV

Edward - Found him to be a dope and a pussy when I was young, now I appreciate him both as a tragic figure and as a party member.

Tellah - Liked him, then kind of hated him, and now I'm back to liking him.

FFVI

Terra - I liked Celes more originally, but as time has gone on, Terra really grew on me until she became one of my favorite heroines in the franchise.

Sabin - Really liked him initially, but later playthroughs made me realize how flat he really is. I like big dumb guys and his story sequence is amusing, but it's clear to me that Shadow, Cyan, and Gau are the more interesting characters in that part.

Setzer - I liked him, but the Advanced version with the better localization turned him into one of my favorite characters in the game.

Strago - Didn't care originally, but later playthroughs and discovering all the little elements of his personal story with Gung-Ho actually made me like the old coot.

VII

Tifa - I originally liked her, largely because I've always had a soft spot for childhood romances in JRPGs but I've honestly come to really hate her, and she sort of represents a lot of what I find wrong about VII. Female Monk? Awesome, except she's more of a damsel in distress than any girl in the game and Aerith is way more of a tomboy than she is surprisingly enough. Upbeat personality? Nice, except Aerith is way better at it and as soon as she joins the party, Tifa devolves into the Eeyore of the party until Cloud assumes the position after his character development. Like Cloud, she gets attributed with a lot of characteristics that only hold true for the first few hours and then it just seems like people forget the next sixty hours when she reverts to everything everyone hates about characters like Rinoa or Garnet.

Vincent - Used to love him because I love my dark brooding heroes, until I realized that his tragic backstory really shouldn't have given him such a personality and then realized it's because he's one of those annoying people who just eats up guilt and always blames themselves for everything even when it's clear they're not at fault. Lucrecia was a bitch Vincent, you're reunion with her should have been you telling her to smurf off before you set her cave on fire and left giving her a double salute of the bird.

VIII

Zell - Didn't like him too much initially because he was trying way too hard to be the comic relief, but after a few more playthroughs, I appreciate what he does for the story and he does have some interesting character moments if you do his sidequest and bring him along for certain parts of the plot.

Selphie - Probably the only kooky genki girl I don't really mind, just because I like how her oblivious nature discourages Irvine's lecherous advances and Squall's mental commentary about her. Her creepy violent streak is also amusing.

IX

Garland - Felt he was just a boring Zemus/FuSoYa expy but have come to really appreciate him as a character in later playthroughs cause let's face it, he has way more character development than the characters he's blatantly based off of.

Steiner - While I liked him initially as a the big dumb muscle character, he's really grown on me due to his earnest nature and the fact he's an expy of Inspector Zenigata from Lupin III.

X

Tidus - Initially felt he was a whiny bitch, now I've decided he's a slightly mature whiny bitch. I like narrator Tidus more than main game Tidus, and I still feel like his relationship with his dad was hardly the tragedy he tries to make it out to be, but he's grown on me over time.

Wakka - Initially liked him despite his jerky racism and fanaticim, but then later playthroughs made me realize that we never quite get the Wakka we we're introduced back and his story never goes anywhere satisfactory. A good character who was ruined by giving him too many "hats" to wear and not bothering to go anywhere with any of it until the awful sequel.

I'll think of more later.