: Oh, I get it now; it was only a vague Star Wars joke it seems.
Actually no, it wasn't. I repeated what the previous person said (hence quotation marks) to underscore how your reasons for using "Marcus" are irrelevant. The only relevant thing is that it isn't the character's name. This community doesn't call him by that name, so maybe just refer to him as the SO, especially since every time you don't you keep getting flack for it.
You could just as easily try to call him Igor, Tabitha, or Mr. Flumby Wumby and use the excuse "I don't like nameless protagonists". It doesn't matter; none of those things are the character's name, doesn't matter whether a fan mod gave him a name, and your personal preferences don't matter when they annoy or frustrate the people you're talking to.