When he runs into the room, you can talk to him, and most options should lead to an unwilling marriage... :/
She can use an SMG, I think. But you can't tell her to stay places. I don't remember if she counts toward your party total, but I think she does. And with a charisma of 6, you'll only be able to have 3 members unless you pick up some Magnetic Personality perks.
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