Vlad’s outfit looks the way it does because he finally “died” after the slow process of his ecto acne while dressed up for halloween.
Danny sends Vlad a Christmas/Hanukah present every year. It’s a box of fruit loops.
Danny Phantom, but Vlad is just a mildly annoying rich guy that Danny likes to mess with and no one ever believes Vlad that a ghost/Danny is messing with him.