The comic characters Nancy Friedrich plays in her one-woman show aren't that original: a garrulous drunk girl, a stilted woman auditioning for a musical, a flustered administrative assistant eager to communicate her edginess. But she gives each of them a richly nuanced portrayal. With her charisma, physical control, and willingness to be silly to get a laugh, even her silence can speak hilarious volumes. Too bad that director Laura Forbes didn't push her to develop odder, more creative characters, because she's strongest when playing a role--her stories about herself simply aren't entertaining enough to have an impact. To fulfill her potential as a comic performer, Friedrich needs bolder writing. Then she might stand out from the sketch comedy crowd. Through 7/17: Mon 8 PM, Playground Theater, 3209 N. Halsted, 773-388-2168, $5.