Seven would be a peaceful, modern-time vampire. He'd have himself a job on a university campus, at a clinic, or at a hospital where he could have easy access to blood bags and smuggle them home, where he'd drink it from a coffee mug like a gentleman. It isn't that he'd have qualms about killing anyone, but, being that he lives among humans in human society, being locked up in prison serving a few life sentences isn't exactly his cup of ... hurr. He wouldn't be in denial of himself, in fact, he'd embrace it thoroughly, and probably be one of those really old vampires that simply had to adapt to modern life, and now he's sort of a geeky old guy in a young man's body.
He'd also wear his sunglasses at night.
Edit: Petch it,
moon child