like, say if you want your vampires to be deathly allergic to garlic, so much that it severely weakens them via smell alone? yeah that works. you want your vampires to only get a small allergic reaction to garlic or no negative reaction at all? that works too. you want your vampire to turn into a bat? a wolf? a goddamn bear if you really want to? whatever you want. do you want the vampire to drink blood but in a sexy-poetic-sad-painting esque type of way? or do you want this vampire to drink blood and look scary like their in a horror movie while doing it, and be completely violent and fucked up looking? can they drink animal blood? only human blood? can they have the option to not have blood at all and drink milk instead? who cares! do what you want! you want your vampire to completely burn and die to any sort of sunlight at all? go ahead! it adds more stakes to the story in the right context. oh nevermind, you want your vampire to just get a bad sunburn? sure! you want a serious vampire story with a shitload of angst and drama? of course! go full on R rated! you want something fun and absolutely silly like hotel transylvania? who cares! just have fun with it!!! vampires are the litteral do whatever the hell you want monster!!