I've had no luck sharing actual vampires.
I saved one of the vampires from Bridgeport. Edited her in CAS - changing her appearance, hair, etc. Then saved her under a different name. The resulting sim has the vampire tattoo and fangs but she has no vampire abilities at all and her eyes do not glow. She was shared on the Exchange but was not classified as a vampire.
See:
I searched the internet, extensively just before New Year to try and discover how to share an actual vampire, as it appeared there were actual vampires being shared on The Exchange. I couldn't find out how to do it and came to the conclusion that the vampires, shared on the Exchange, were born or created in-game and shared on The Exchange without any alterations being made in CAS.
Still, I'd be happy to attempt to make a purple-haired guy for you - though you'd have to 'turn him' yourself, in-game - with or without fangs. If you want me to try, please will you let me know the name of a couple of actors that you'd like him to look a bit like? My idea of 'city boy' may be totally different to yours.