From the extensive portrayals of vampires in various adaptations I think that the following shows wether or not this guy is a vampire. Does this guy follow any of these symptoms?
Number 1 does this dude have a reflection because if not there's a good chance that they are a vampire
Number 2 do they not go out during the day if so there's a good chance they are a vampire because vampires can't sustain during the sun but if this person does not combust during the day outside in the sun with nothing blocking the light then there is a good chance they are not a vampire
Number 3 does this person have a phobia of the following things crucifixes, garlic, fire and (I'm not joking as in one adaptation this was a case ) water if so this person is scared of the things that commonly kill vampires wow it's all starting too add up now isn't it?
Number 4 has this person ever turned into a bat before your very eyes believe it or not normal humans don't posess this ability so you know vampire
Number 5 have you ever had a sleep over at this persons house and they sleep in a coffin well get this vampires often tend to sleep in coffins dun dun duuuun and last but not least
Number 6 has this person ever drank human blood or said the following things to you "man I'm thirsty for blood" and "your neck can I bite it so blood draws" and finally "I am a vampire I need blood to sustain care to donate" because if this person has said any of these things chances are your dealing with a vampire.
