Sweet
Who'd have thought, a dancing demon.  Wanting his relationship with ex-demon Anya to have a happy ending, Xander summons Sweet who arrives in demon and causes the whole to succumb to a whacky Broadway nightmare.  There's singing and dancing galore, only the dancing goes to far and some residents end up combusting. 

He sends his henchmen off to find the person who summoned him who he must now make his Queen.  But since Xander cast the spell, Dawn has found the shiny trinket he used at stolen it, so she is one that ends up kidnapped.  Of course a life-0weary Buffy has to come to the rescue of Dawn once again, and when Xander admits it he was one the one did the summoning, Sweet forgoes the whole 'Queen' issue and returns from whence he came.
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Sam Finn
Sam was working with the Peace Core in Central America when demons hit her infirmary, she just managed to survive.  That's when she moved from Peace Core to Initiative and met Riley Finn.  They were soon married and tracking demons as a husband and wife team.  Whilst tracking a demon, Sam and Riley find themselves back in Sunnydale and enlist the help of the slayer.  While Buffy and her friends try desperately not to like her, they soon find themselves falling for her too, as she talks on the level to each and every one of them.  She even managed to win over Willow who is determined to hate her on Buffy's behalf.
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