Zero day OC??

Hii this is my first post ^{_^} 17 audhd guy here! I have a question, could I make a zero day OC? (I mean ofc I could with free will) I'm just asking if it's too taboo considering the plot of the film
Cuz I just wanna make a little oc for silly non canon stuff and the movie is 21 years old but idk and I don't wanna seem like a freak