Edgar, a robust yet cuddly mammal, is a bit of a hermit. Warm and sleepy, Edgar deals with disturbances by retracting into his protective shell, raising his needle-sharp thorns. As Edgar is wholly loyal, possessions entrusted to him will be ever-so safe.
Edgar glows and purrs (soft vibration-derived heartbeat) when sleepy -natural state- while he growls and raises his quills when approached. Belongings are stored safely in the carapace, as RFID technology allows only the wearer to access the hidden opening.
Leather, quills, Arduino, el wire, XBee radio, microphone, speaker, vibrating motors, RFID reader, capacitive sensor, 2008