User with this ability is a werewolf with the ability to transform into a wolf or an anthropomorphic wolf-like creature, either purposely or after being placed under a curse and/or lycanthropic affliction via a bite or scratch from a werewolf, or some other means. This transformation is often associated with the appearance of the full moon.
The user gains the traits of werewolves, most obvious being ability to change into a wolf with the natural characteristics inherent to both wolves and humans, including senses, stamina , etc. In addition werewolves are often attributed strength and speed far beyond those of wolves or men and may have them in lesser amount even untransformed form.
Other than this, details vary considerably: some are limited to single form which ranges from completely animal to man-wolf (humanoid with fur, claws and fangs); some can shift between human, wolf-man (humanoid wolf) and pure wolf; while others are able to choose to what extend they want to change and what parts. Their wolf-form may be completely natural wolf in form, something resembling Dire Wolf or even something directly from the darkest dredges of human fear for wolves. Although some wolfen instinct is likely influence werewolf in transformed state, this varies from completely animal mind to perfectly aware human, even to the stereotypical monster lusting for blood.
Although it is very commonly linked to werewolves, they aren't all vulnerable to silver or other traditional weaknesses. For some these are no more or less harmful than any other metal or substance, some are essentially un-killable for anything else.
Wayne (Hotel Transylvania) is a prime example, although not like most werewolves, he takes a job as a data processor.
Wanda (Hotel Transylvania) is another prime example, although unlike most werewolves, she's sweet and kind-hearted.
The Werewolf Kids are Wayne and Wanda's ill-behaved children.
Winnie is the only daughter in the family who respects her father.
Free (Soul Eater) in his human form...
...changes into his werewolf form.
Wolfie (Casper's Scare School)
Due to his werewolf nature, The Captain (Hellsing) possesses superhuman senses, strength, speed, reflexes, agility, dexterity, coordination, balance, durability, stamina and regenerative healing factor.
Little Red Riding Hood/Ruby (Once Upon A Time) has a dual role as both Red and the Big Bad Wolf
Nina Pryce (Marvel Comics) was born a werewolf.
Olivier (Heartcatch Precure! Movie) real name is 'Loup-Garou' meaning 'Werewolf', due to the fact he's an actual werewolf. Although....