I haven't played DBD so I'm not going to vote just some thoughts.
I think if this goes through it'd be weird to have a singular character tag divided between two copyrights, apparently there are visual differences on the coat, in practice I don't know if that matters or if it'd be worth dividing the tag in the event this goes through.
My other thought is that when people search for Scream (Movie) they are indeed looking for the character of Ghostface with his their cheap mask the fact that he is a borrowed character doesn't really matter to most I'd assume and given the plot of the movies I think a wider tag is desirable.
I also admittedly find this pedantic. It'd be like tagging Captain Kirk on Michael Myers's art because that mask is just William Shatner's face. For the purposes of pure searchability I find the suggestion weird, but again not a DBD player, maybe the fact that it's not the "same" Ghostface does make a difference.