I think it could be an option. Like, for canon chars, list a fandom or for fandom ocs, list your fandom, but other than that, try to give a sense of your character as though people don't have a clue about the canon. It would give people that don't know anything about certain canons a better glimpse into them and it wouldn't make any ocs stand out so blatantly because 'OMG OCS ARE DUMB OK'.

I don't see why ocs would be embarrassed to be in an OC MEME. I could see if someone threw a canon character in there because they weren't reading the rules, but this whole mentality of ocs being shit is unfair to the people who actually put a decent amount of work into their backstory for an oc instead of grabbing the newest pretty face and slapping it onto a generic 'average girl/guy' for smut purposes.