Kerberos
First Appearance: Harry Barker and the Napier's Bones (August 29, 2008)
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In Sharon's dream world of Harry Barker, Kerberos is a three-headed robotic dog hidden on the third floor, East Wing of Hollerith's School of Phreaking and Hacking. Although its presence was unknown to the majority of students (and perhaps faculty) of the school, it had been placed there by Professor Dumpingcore and a handful other faculty explicitly to guard the Napier's Bones from being discovered. Unfortunately, Harry Barker and his friends were able to social engineer groundskeeper Dexter into revealing the Kerberos password ("Play Harp.mp3!"), allowing the children to bypass its security in their pursuit of the Bones.
For Harry Potter fans, Kerberos is roughly analogous to "Fluffy", the three-headed dog.