hmmm a pretty general question, i'm not sure if i can remember every instance, so here are a couple that come to mind!

• Element was my first tsumugi story, so i started off feeling like i would never understand him enough to like him. anyway that's long since changed quite a bit
• eichi i thought i understood when reading !-era. as time passed i gradually got more and more confused and realized i understood him less and less and now i feel frustrated with my lack of understanding
• trickstar i foolishly expected to be a flat and stereotypical 'protag unit'. instead i was injected with pure love and whimsy. subaru in particular surprised me, i didn't expect him to be a complete submersion of the "shining, positive, and genki" trope!
• my ex-enstarrie friends were enstarries when Marionette dropped so they had a really negative view of shu, so i didn't expect to like him when i joined the fandom... and then i did LOL
• i didn't expect to like sora at all! i had the impression that maybe he would be written flatly with an exaggerated emphasis on "quirkiness". but then as i read him i would find myself relating to him at every turn :]
• tori given his early writing gave me very little hope for his character development, so as more and more released he'd always impress me so much and make me very happy. just felt like i should mention him too