Halloween // Ideas about a costume with stuff I could have at home?

I'm not sure this is the right subreddit, but I others about just costumes I found were like restricted. Btw, my friend, going to be 18 in two days, would like that the guests dress up like movie, TV series or cartoon characters, using what we have ready at home. I asked in his gift chat group (without him) if I was the only one who didn't have any idea, others were like me and then my friend gf said she suggests classic movies, but honestly I still don't know what to do. I would really appreciate any suggestion. For more context I'm a brunette girl, and nothing too crazy because we will dine out.