Erato - Muse of Love Poetry
Erato, being one of the older Muses, has been split into several different beings in myth, including Aphrodite, Helen of Troy, and tons of fertility goddesses. Her arrow necklace is a gift from Cupid, her son. She's a bit of a meddler and much like the other Muses, is a huge gossip. She's also a frequent collaborator with Melpomene (tragedy) and Thalia (comedy).
Oh, and for fun she likes to give people awkward, naughty dreams.