Our Vampires are Different
Many medias have Vampires in their works, but they always had differences in how to portray them.
The "baseline rules" are largely literary and cinematic inventions from the 20th Century with only limited ties to older works and the original folklore. For instance, the vampires weakness to sunlight is not from folklore, but may have its origin in the 1819 novella "The Vampyre". Sunlight holds no relevance to its vampire, but moonlight heals and revives him. Next up is the 1897 novel "Dracula", which vampire suffers only the loss of his vampire powers in daylight. Following this build-up, the 1922 film "Nosferatu" was the first piece of media to portray sunlight as deadly to its vampire and its been a thing ever since.
The sheer number of different and contradictory myths that have built up around vampires over the years have made it difficult to explore all of them in great detail. To deal with this, many writers have started putting multiple types of vampire into their setting, with the explanation that different myths describe different types of vampire. These are often referred to as "bloodlines", although any term suggesting shared descent or culture may also be used.
Another effect of the various vampire myths is that some traditional weaknesses might work while others might not. A vampire might laugh off crosses and garlic but instantly combust in sunlight. Many a vampire story involves the heroes figuring out what aspects of the myths are real and what was just invented for fiction, possibly perpetuated by the vampires themselves to give humans a false sense of security.
Examples:
30 Days of Night: In the movie version of the comic book, the vampires, though still snappy dressers, have pale skin, completely black eyes, sharp fingernails, and shark-like teeth. They tear their victims' throats out to drink blood, and they behead them so they don't turn (they don't want the competition for food). The vampires are also vulnerable to UV rays (a UV lamp does considerable damage to one), and beheading is also an effective way to kill them. Though they can speak, most just hiss and shriek. These vampires are very clever and vicious, and are essentially walking sharks.
Count Duckula: The titular vampire has been killed and he can be brought back by a once-a-century secret ritual. In the most recent ritual, tomato ketchup was accidentally used instead of blood, resulting in the title character becoming a vegetarian. And he's a duck, which is pretty different all on its own.
Hellsing (Manga): The vampires from this world diverge somewhat from the norms. Humans who are artificially "turned" via special chips or, in the manga's case, by surgically implanted bits of Mina Harker's remains exhibit "standard" weaknesses. However, more powerful "true" vampires can ignore the rules. This is especially notable in the series' sociopathic hero, Alucard, who survives decapitation, holy bayonets and any number of other attacks. He dislikes sunlight, but it won't kill him. (It's also been said by his boss that the organisation has spent 100 years "enhancing" his abilities beyond the normal limits).
Dracula (1931): It's mostly close to the original novel. However it also gives Dracula the ability to transform into a werewolf like creature, as well as another one that resembles a humanoid bat.
Buffy the Vampire Slayer: The show's vampires are described as a type of demon (just one of many) possessing a corpse; this is actually consonant with many Eastern European vampire legends, 'vampir' deriving from 'upir', a variety of psychopomp that evidently sometimes can't resist the temptation presented by a now-vacant body. They are said to lack souls, explaining their amoral behavior. They have "demonic" faces that only appear just before they feed or during a fight, or any other time the writers want them to look more intimidating — Whedon explained in interviews that he was unnerved by the thought of a teenage girl murdering normal looking people on network television, so the "vamp face" was created to allow for guilt-free slaying.
Buzz Lightyear of Star Command: There's a robotic vampire called NOS-4-A2 who drains the energy of robots and other machinery as opposed to drinking blood. He also has mind control abilities over said machinery. In combination with radiation from a certain moon, it also can turn humans into feral werewolf-like mechanical creatures called "wire-wolves".
Vampirina: Vampirina and her family can't (or don't) drink blood and aren't weakened or burnt by the sunlight (though they do have to use strong sunblock since, as nocturnal creatures, they're not used to being out in the daylight all the time). They do, however, still have an aversion to garlic and they can see their reflections. According to Vee's parents in "The Ghoul Next Door", there's all kinds of vampires. Some look very human. Additionally, Oxana mentions a family of vampires in Northern Transylvania who tend to keep to themselves.