I haven't heard of this being pathologized before. I guess part of it may depend on what extent you love this character. You're not alone, though. I follow the anime crowd to an extent and it's really not too unusual for someone to admit they've fallen for a character. I don't think this is strange because these characters are designed to be attractive. Same goes for tv shows or movies hiring real people as actors. But, if this is something that is really bothering you a lot or especially if it is interfering with your life in some way, if you have a T it might be something to talk about.