Bad Bishop

Bad Bishop is the anonymous screen name for an online chess player. Their biggest opponent thus far has been Mona Vanderwaal, and the pair have formed a friendship online. Bad Bishop presumably lives in Beacon Heights, Oregon, as they were able to meet inside Beacon Heights University.

Appearances
Season 1
 * Sex, Lies and Alibis (Indirectly mentioned)
 * ...If One of Them is Dead (Screen name: mentioned)
 * The Patchwork Girl (Screen name: mentioned)
 * Lost and Found (Screen name: mentioned)

Notes and Trivia

 * Their username is of a white bishop.
 * This user either beat or nearly beat Mona in "...If One of Them is Dead".
 * Mona and BB were supposed to meet in person for the first time in "The Ghost Sonata", however, BB never showed.