We did it for music, let's do it for characters.
On which character(s) did you change your opinion the most (positively or negatively)?
Positively:
Koishi used to be one of the only characters I actually rather disliked because I found the whole "no mind" deal rather creepy and depressing. Now she's pretty much one of the most interesting characters (exactly due to that), and she's quite cute. Gotta admit that's a bit of flandreflanderisation because it's more of a "look, so adorable!" deal rather than a "look, so scary!" one.
I remember doing one of those touhou chars sorting lists a while ago, where Koishi scored #38 at first. A few weeks later, she suddenly jumped to #2 and is pretty much #1 now in my books.
Mokou is a distant second place, I didn't care about her much at all when I first learnt about her or even when I met her in-game, because IN was just that rather boring game with rather boring characters at that time. But then eventually she sorta replaced Koishi as my depressing character, what with her becoming immortal and facing a fate worse than death. Contrary to what my avatar might imply, she's not my favourite or second-favourite, but she should be around #5 or #6 and is a cool character overall.
The world needs more Mokou x Koishi.
Negatively:
I haven't exactly grown to hate or even dislike them, but the Prismriver Sisters aren't really anything more than "nice" to me. My first impression was that wonderful theme they had, that really difficult battle (at that time), and I swear when I first saw Lunasa I thought she had no arms (the artwork cut off, and her sprite had them really close to her body), so I found that a tad creepy as well (plus that stern stare; she's a poltergeist after all). Now they've just been replaced by other characters as I started playing more games, and the three are hard to separate, so you can't even do very much with them (they were in PoFV, which I found awesome, but then they were among the few characters not to be featured in StB, and after PMiSS, ZUN forgot all about them). Compare to Youmu and Yuyuko, who became mainstays through IN, TD, the fighters, you name it. Note that this doesn't mean I don't like the Prisms anymore, they're just only a bit above average (Lunasa and Lyrica, that is, Merlin has never been that interesting to me).
BT earlier asked whether there was a correlation between them and their theme. I guess so, as when I lost interest with the theme, the same happened for the characters, and both really have been replaced as I played more games with more music and girls.
Then there's Nitori, who was my favourite MoF character when I first played that game, because she was cute. But that's all there really is to her. She's cute. My interest in her waned rather soon. And then there's that questionable SoPM article (although SoPM in general is rather questionable).
Your turn!