Sounds like Heero Yuy of Gundam Wing fame. Plus the being educated by TV things. I would expect him to talk little, if at all, and be extremely terse, military-like, and efficient in his communication. Talking isn't for expressing emotion, just communicating information. His emotions come out in other ways; violence, probably, since it's what he's good at. It takes, like, nothing to set this kid off. If anything seems remotely like what he saw in that action movie, he takes action, killing people who have no idea what's going on, and when someone tries to stop him, they die too, and he then wants to flee.

How he doesn't do that, however, is a good question, since you're likely playing with other people and there's a story you're trying to accomplish. Frankly, he'd be really good at missions, and just emotionally detached. He doesn't get offended or pleased or anything, he only reacts after he's analyzed the cues and found a fitting model from a TV show to copy, which will naturally be completely incorrect due to context.