This is a bit hard to explain, but I'll try. When I daydream about a character a lot, after a while I find that I can't remember their facial features that well. If the character is from a movie/tv show, I'll have to watch it again to remember their face. I know this is pretty out there, but does anyone else have this problem? Normally people have this issue when they don't think of someone, not when they think about them often.
Oh my god. This is the thing that I've been struggling with forever.
For me it's images. Sometimes if I even get a glimpse at a picture of someone else, it'll completely ruin the characters in my daydream and I'll have to stare at pictures of them for an hour.