The Goddess Girls series by Joan Holub and Suzanne Williams is a painless introduction to characters from mythology. In this story Persephone is named "Most Dependable" in a Teen Scrollazine poll. She feels that dependable equals boring, so she resolves to be more daring and change everyone's opinion of her. She and the other girls from MOA (Mount Olympus Academy) have a slumber party and play a game of Truth or Dare. Persephone chooses to take a dare since it will make her seem more "daring." To fulfill the dare she has to get the autograph of Orpheus at his concert. That leads to Eurydice (Orpheus' girlfriend) staying at Persephone's house when she comes to visit MOA with Orpheus. Hades and the other godboys feel that Orpheus is getting too much attention from the girls, but Hades especially thinks Eurydice is a bad influence because she is so fickle. Her flightiness gets her into one problem after another and the goddess girls realize she is not dependable at all - she is the complete opposite of Persephone.
These books are funny and fairly quick reads. Each one focuses on a different character like Athena or Cassandra, but the rest of the MOA students are in the stories, too. Readers who enjoy school stories that deal with popularity, friendship, and other issues will find plenty of those situations. For those who like stories that re-imagine famous characters from mythology (like Percy Jackson or the Kane Chronicles), but want a book that is not quite so thick - these may be just what you're looking for.