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.
I knew a guy that was CONVINCED he was a werewolf. He would refuse to go out on full moons and would bark/snarl at people in school if they got too close. He’s in prison for CP now.
That sounds like everyone ignored the very obvious giant red flags of his deteriorating mental health