Quiet, but not shy, Penelope has a very playful personality and only seems coy on first impression, but when you begin actually speaking to her and getting an idea of who she is she's actually rather outgoing and friendly - she's just also not loud about it. She loves parties at the beachside so she can seem very typical of a Lambda, and often goes to collect seashells when they've died down, a bit of a hobby of hers.
She has had a habit of getting wildly drunk and not remembering anything about her evening, though being as she is so small and 'cute' her friends tend to make sure she gets home safe and sound - or at the very least to one of their homes. Being as she's a young adult, her abilities are rather moderate - she's able to strongly sense the emotions of those around her but Penelope has less practice in the control and change of people's emotions. Nor is she particularly bothered about trying to correct that, but times may change.