Vampire Troubles...

[Red Heifer]

I'm having a bit of difficult finding the vampire in my fortress. I decided this run to allow guests to visit all my zones and go and behold a vampire. I've also accepted a few barb groups and dancers into the fort. Not entirely sure if this helps, but with 150 dwarfs, I find it kinda tedious to go through the whole list to read everyone's sheet. I'm thinking about just flooding the fortress on my retirement to see who it is. I've had 3 deaths. So I don't think it's a visitor, and I've interrogated the blue dwarf, it didn't reveal anything. I've also interrogated 30 dwarfs, which helped me find out some confessions about stolen objects.

1. Any easy way to find a vampire?
2. What should I be looking for stat sheet wise?
3. How often does vampires feed? Maybe I can catch them.
4. I'll have to check the wiki again.

[Le Benjo]

I would check the name of this blue dwarf. If it's a nickname (one word name, unlike usual dwarven names) I would try to change it. If It keeps reverting back to the original nickname then you have your vampire.
-> A vampire might come from a migrant wave. If one does so, he will join with a fake identity (the nickname) wich can't be changed.

Hope it helps, you could try it RN.

[Fel]

Have you tried looking at the wiki (number 4)?
https://dwarffortresswiki.org/index.php/Vampire

There are several ways, some more legitimate than others.

Having allowed visitors makes it a bit harder since you don't know if it's one of your citizens or not.
For your own dwarves, looking at someone that wants to drink but hasn't met that need for a long time usually makes it much easier, since undead don't eat or drink.
This also often results in vampires and necromancers having a harder time maintaining a good mood (eating, drinking and sleeping are frequent good thoughts for living dwarves).

The usual legitimate way to figure out who the vampire is is to do it through the justice system, interrogating dwarves, trying to figure it out, but it can take a while before you have enough clues to make a proper guess.

[Red Heifer]

Thank you both, I will definitely try change the nicknames and look through their needs. Guess im turning this into a CSI episode. Going to interrogate the whole fort. I wish the names were alphabetized and an auto investigate all button. Been trying to stay away from that dhack mod. Trying to get a vanilla experience.

[Red Heifer]

Okay, so i've figured out who the vampire was. He didn't have any thoughts of drinking or eating recently, then i thought it was weird, he had horrible thoughts about him having to have killed someone, so i burrowed him [ which i think burrows are broken, they just kind of stand there with "no job"] but either way, i followed him, removed his jobs and he went into someones room, became a hostile red vampire and killed someone, he had a previous thought of having to kill someone, which was odd, since he hasn't killed anyone and had this tag "Zero Kills" in his history. He also had pale blue skin. Either way, i gave him some dwarf justice and walled him inside his cell in the prison. Thank you all.