Depends if a Lycan is in their wolf form or have partially shifted their teeth then any bite could be fatal depending on what part of the body, since Lycans are natural born only, they aren't capable of creating a change bite or a bite that might have a killing agent if that's what you're meaning. A vampire's fangs are actually pretty delicate (luckily a lost tooth can grow back, kinda like how sharks are able to replace a tooth if they lose it) and would serve no purpose as to severely injuring a person but since vampires are both created and naturally born they do have a change bite and if they were to use such a bite on a Lycan, then it would cause grotesque mutations and will always lead to a painful death. As to your question about humans, that's another story entirely and that's also a surprise.

Yes, London.

The werewolves do indeed have a leader... For now they have no role since I'm unable to make him at the moment.

You're characters are accepted. But Logain needs an age, nothing older than 3,000 and reduce Hades' age to the same standard.