Thomas is a White Court Vampire, or incubus. Unlike your normal vampires (if you can call Red and Black Court vampires normal), White Court don’t feed on blood, they feed on emotions, specifically, in the case of House Raith, lust. Not only is Thomas extremely good looking, he has a glamour surrounding him which makes him sexually attractive. This can affect both men and women. This is something he cannot turn off. If you meet him, you will notice him, and there is a reasonably high chance you will be attracted to him. However, unlike the rest of his family, he tries to control it as best he can. He tries to be monogamous (he is in love with one woman, Justine).
Thomas feeds during intimate contact with (in his case) women. Basically he merges his life force with that of whoever he is with, and pulls a little bit of the victim’s away when he is finished. However, he cannot touch anyone who has been touched by true love. True love occurs when you are selflessly in love with someone, and they love you in return, and you have had sex with them. It is to do with the mingling of energies between the couple – White Court vampires cannot touch this. It doesn’t matter how long ago this was, as long as you don’t have sex with anyone else, that energy is still the strongest touch on you. As an example, if Bob were mortal, even though he has been apart from Winifred for 800 or so years, he would still be protected. True love causes physical pain to White Court vampires, causing blistering at the very least. They also cannot touch items such as gifts that have been passed between true lovers – for instance, his cousin Madrigal was poisoned by the thorn of a rose passed between lovers.
The village has provided him with his own version of The Coiffure Cup, his salon, as he has in the books. He will feed primarily from npc’s, though if you are there, and have your hair done by him, he will take a ‘nip’. Please note, if you are touched by true love, he will not be able to touch you at all. There will be npc's working at the salon as well in case of this. As a result, the salon is pretty much always open (officially, 10-7pm, Mon-Sat). Please talk to me if you aren’t sure.
One more thing. He is almost fanatically loyal to his family. If you hurt, in no particular order, Harry Dresden, Maggie Dresden (and if she arrives), Lara Raith, he will hurt you back. Hard.