Here's a seasonal one (since I'm almost out of my novelty M&Ms and need to drag my behind to Walgreens and get some more and am thus craving chocolate...only good thing about card-industry-created-non-holidays: ready availibility of candy that you can't find at other points of time in the year. Which is why I'm looking forward to easter.)
Congratulations! You are
a flying baby that shoots people
. Nevermind the fact that you're a bastardization of a mythological figure that has inspired some of the most wonderful works of art ever, or that your supposed power is akin to the sideeffects of Rohypnol and other date rapes drugs combined with a smidgen of brain washing, a couple of pinches of elimination of free will, and a sprinkle of "men are only playthings for you to amuse yourself with." We'll overlook all this for now. Since society decided that you are the ultimate match-maker, the ultimate matchmaker you shall be.
Everynight, you will send me the names of two people who you wish to shoot with your arrows. If your aim is true, they will fall in love with one another and all be happiness and bliss. You win when *every* player is a monogamous relationships with one other player, there is no unrequited love around, and no threats to this perfect harmony remain. No night actions work on you, but you may be lynched.
Bastard mod note: throw this role into a game where there are polygamous or cheating lovers. Or better yet, throw this role into a game of cynics who will be immune. Or cannibals that eat babies. (If you don't want to add this bit of bastardry, it is still impossible to Cupid to fulfill his win condition. Every player includes him, and since no night actions work on him, he can't have any success shooting himself.)