Mia - Niles' weakness does not fall under this category. We're are specifically pinpointing species weaknesses such as Vampires being weak to sunlight and were's being weak to silver so Niles can keep his weakness :-)

Kirk - Definitely! Vampires can have a power of being able to walk in the day or weres who have no issues with silver! However, in cases like these we do ask that the weakness does have some very intense thought put into it because they won't have that species weakness.