I had a couple classmates that pretended to be vampires back in elementary and middle school. They’d pretend their Koolaid was blood, complain about the sunlight, and bite their friends a lot. Not enough to draw blood, though. I haven’t kept up with most of them, but one guy is a teacher now. He seems pretty normal.
In pre school my twin sister and her friends thought they were fairies when they argued for example they would make up stories about each other being evil fairies and stuff like that lots of funny drama what’s embrassing to me is that they got me believeing in it too, fun stuff