Boras

 is a pet in.

Background
According to Note on a Missing Subject, Boras is the library mascot.


 * "Boras has gone missing. Likely infested, digested, or worse. What began as an irritation has escalated to a tragedy. I haven't the heart to tell the Archives staff to call off the search. Once the dust settles, I will take it upon myself to find them a new library mascot."

Contrary to popular belief, Boras is neither infested nor digested.