Do you idolise the celebrities or fictional characters that you feature in your fan fiction?
As a matter of fact, it may be considered this way. My fan fiction may be thought of as a modern age way of having polytheistic gods or otherwise heroes, that can be used for guidance and for shifting the blame from you, similar to the way that Plato used dialogues with Socrates for that.
Note that even if I idolise (or perhaps just idealise) a person or a fictional character like that, it does not mean I actively worship them using pagan rituals. Nor do I believe they have supernatural superpowers, or see them as a supreme authority of telling me what to do. So I believe it does not go against the Jewish ethos. Moreover, the Jewish canon, sported some similar idols/"gods"/heroes besides "Jehovah" / God / the "King of the kings of the kings" / haqadosh barukh hu however they/he/she/it are manifested. For example: Moses, [King] David, and Deborah, are all such heroic figures, and I featured my own takes on some of them in some of my screenplays and stories.