When they discover they've got a crush:
Charles wouldn't be too quick to act on a crush, mostly because the lifestyle he lives doesn't really seem to be one where romance can thrive. He also sees the poor relationships occurring around camp, so he's not sure if that's what he wants to get into. He couldn't resist being curious about you, though, listening in whenever he hears someone mention your name to see what they were saying. He would also enjoy spending more time around you, not minding if you came over to talk to him while he was busy (you're about the only person who can do this without annoying him).
How they confess/hint:
He's slightly more talkative around you, willing to hold up a conversation where he'd otherwise want to be left alone. He would think the direct way of confessing is best, just letting you know how he was interested in you romantically, but he finds it hard to think of the right words to get his point across. It takes him a few months before he can finally admit these feelings to you, planning on having you and he be alone so he's not interrupted by the other gang members.
How to win their heart:
Be respectful of him and his space, and understand how he communicates is mostly through action. He might not have an arsenal of fancy words to woo you with, but he appreciates simplicity in life, and would like if you were the same sort of way. Someone who is patient and kind would also catch his attention, because he feels there's a severe lack of that in the world at this point.
How to break their heart:
Prove to be an awful, selfish person who considers their own needs above anyone else's. Be disrespectful towards others because of their culture or skin color (he'll drop you quickly if you prove to be a bigot, without hesitation). If you spread around things he's told you in confidence, or tease him (in an extreme, he's asked you to stop and you won't sort of way) about things he's self-conscious/worried about, he'll probably reconsider having you as a partner because trust means a lot to him.
Things that make their heart flutter:
Being the type of person who's respectful, and interested, in his people's traditions. Don't just talk at him, talk with him, and listen to him when it's his turn to talk. He actually very much enjoys physical affection, being held or having his face kissed, as long as it's not in front of too many people (he prefers the romance be kept between the two of you, he feels its something special just for the two of you).
Their type:
He likes people who aren't obnoxiously loud, but do know how to enjoy themselves and smile every once in a while. He wants someone with decent enough morals, who doesn't kill just to kill or for fun, and who has a respect for nature. They'd have to be tolerant, respectful of his space, understand that he likes to be alone occasionally to recharge, and independent enough to take care of themselves if he's not around.
Goals in a relationship:
Charles wants a family, and always known he has, but he's not going to force anything on his significant other. If they're not interested in children, he doesn't know what he might do, but he figures he'll deal with the situation as it comes. He would like to have a simple, traditional wedding, something that would mean a great deal to him if you agreed to it.