ooo thats another thing.
Does running water, garlic, crosses, holy ground etc.... have any effect?
What, if any, sorts of other creatures, creepy fairy biddies, wizards, etc... exist in your world?
So Dante doesn't have a speciality yet? Ok then (got confused when you listed Vivians and just put really ridiculously good looking for Dante ) i suggest something flashy and ostentatious. Like fireballs. Fireballs are always a good decision. *nods head sagely*
If they're up during the day, and living their 'true' life at night, when do they sleep? Do they sleep?
If they must sleep, or rest, do they do it in a coffin? (do they do it in a coffin? lol sorry couldn't help the pun it was toooo good)
Can they regenerate lost limbs? How about fingers if not limbs? Do normal weapons harm them? Must they be staked in the heart to die? What about decapitation and scattering of body parts?
Another question, is a vampire born, turned, or can it be either? (think the Blade series.)
Does someone have to get munched on (literally none of the eating ambient energy) to rise again? Is there some esoteric process?
Are there many vampires? Do they know about each other? Is there a club with a cool handshake and nifty badges? Are vampires common knowledge to normies?
Since this is urban fantasy, let me give you some advice from a concerned reader and all around bibliophile (book lover). IF you are going to have other mythical/supernatural etc.. beings in your world and IF you are going to have some of those be were-wolves, please please please for the love of all that is good reading don't make said were-wolves and vampires automatically hostile to each other. Its been done to death. Not to say that some were's and some vamps can't hate each other. Just don't make it some sort of given for the universe. Please. I'm literally begging you on my hands and knees.
Okay umm....hmm....let's address each question at a time.
It may be that running water disperses magic and so it could weaken a vampire but not enough to kill....unless they were being murdered to death in running water. As for crosses, they're quite fond of looking at crosses (I couldn't help myself there). Garlic only instinctively makes a vampire hand you a breath mint. Holy ground....that's a bit more complicated. There is a respect there if anything for those that believe in it. I first climbed on board to the idea that places, objects and words can have power but only if you believe hard enough when I first read Death: The High Cost of Living. I carried that with me and the more I studied religion, the more it made sense to me. So yes and no. To each his own.
I'm debating bringing other fantastical beings in. On one hand I'm thinking I'm going to have enough on my hands sorting out the world of my vamps and on the other, if there are vamps out there shouldn't other mythical creatures exist? I don't know, it may be something I work in later if I have enough brain cells. I also don't want to be ripping off any of my...ahem....favorite authors.
I'll think of something way awesome for Dante to be sure. Levitation could be a fun option if not a fireworks show. Well, at least levitation could be a lot of fun for Viv.
My vampires do sleep. They don't need as much as mortals though. Feeding tends to be the equivalent of a Red Bull or Sobe Adrenaline Rush (Trademarked but yummy)! They also don't need coffins but dark helps, sensory deprvation is even better. If they wanted to do the whole traditional vampire thing, they could but it's purely for show. Sleeping under glaring lights and the grand stands at a monster truck rally is no fun for anyone. As for doing it in coffins, kinky and I'll ask Dante sometime. I bet he'd go for it. Just not at public funerals okay? That's the wrong kind of necrophilia.
They are immortal, not starfish. If they lose a limb or several limbs, it may come down to them gnawing you to death (only the most stubborn and frankly bizarre vamps would dare such a thing). They heal very fast but scars are with you for life or unlife as the case may be.
Can be born or turned. The key element is the blood but science lesson later. If enough blood is exchanged, a mortal can turn and yeah, it's painful. I'm not sure. Is dialysis painful? Doesn't seem so but I've never had it done. I know IV's hurt like hell, especially by inept nursing assistants who keep missing your vein and wiggling the needle around but I digress.
There are vampires in every part of the world but I'm thinking that they've been fairly well picked upon (and picked off) by the :Van Helsing Society:. I'm getting the feeling that they're kind of like another race but I'm not sure if I'd like them to be out and about for the general knowledge of all. I think they'd be cut up in the name of science and there is the potential for them to be treated as things without rights or feelings. That is still in debate with me. I'm not sure which would let the story flow better yet. As for them knowing about each other, there are some with psychic skill and the Society is relentless in it's pursuit of knowledge so I'm thinking there may be those that know and those that don't.
As for werewolves, nope, not going the Underworld route. Lycanthropy exists as a documented medical condition but I'm not even sure if I'm going in the all out mythical/fantastical other creatures route yet. If there is ever conflict though, it's probably going to be over who cheated at cards or some wise-crack about scruffy looking Nerf Herders.
*smoke begins to drift out from ears before she falls out of her chair and into a panting heap*