Most likely has some basis in fact (Vlad the Impaler, Elizabeth of Bathory, Porphyria victims, etc.) and then was later greatly exaggerated once
folklore was added into the mix.
Some basis in fact but, again, perverted with folklore. In some occult circles, there are those who grow out their body hair, do not bathe, eat raw
meat, are extremely violent and feral, etc. They are sometimes designated 'werewolves' and are often avoided and feared by other occult members. But
they don't shape shift at the full moon, in other words.
They possibly exist. In my opinion, they're simply some mundane species not fully discovered or known about yet. Back before the gorilla was
discovered, witnesses told some of the craziest accounts and gave some very far-fetched descriptions of the creatures. After officially discovering
the gorillas, they accounts were proven to be highly embellished. So if any of the above creatures exist, I have a feeling it would be along those
Possible but I don't know. Aliens- possible. Ghosts- could be the deceased or some form of demonic manifestation. Poltergeist- could be the deceased,
demonic activity, or some form of phenomenon caused by telekinetic energy.
Due to my Christian beliefs and some personal encounters, I believe the above exist.
Possibly existed at one time but the accounts were greatly exaggerated. Or they still currently exist (some form of reptile or dinosaur throw-back)
but were greatly exaggerated.
I don't believe any of the above do or did exist.
I'm not familiar with any of these things.
24.if it is possible to become any of these and how
Well, if they actually exist, the only one I could see you becoming is a ghost. lol You could pretend to be a vampire or you could display the
actions of the werewolf I described above and, sure, if you want to go around to graveyards eating the dead then be my guest. But it would be my
opinion someone who did such things would be forcing themselves into that role while pretending. It wouldn't be the genuine, stereotypical belief of
those things like a human who changes into a wolf at the full moon or a vampire who is allergic to the sun.