According to Cleo, Scary Murphy's a fearleading legend, although it's unknown whether that's as an ex-fearleader or as a fearleading coach (or both). Either way, Scary Murphy has a knack for noticing talent in a fearleading squad and bringing it out by challenging that squad.
During the Gloom Beach mashionals tournament, Scary Murphy singled out the Monster High fearleaders as her protegées and forced them to do seemingly pointless jobs with the secret intent to familiarize them with a large set of moves they could use in their routine (since they were the Wild Card team). However, her bossy and offensive attitude left almost the entire Monster High fearleading squad to resent her, with Cleo being the only one to keep faith in her.
After the MH-fear squad won the tournament with Scary Murphy's moves, Scary Murphy became much nicer and friendlier to them, explaining why she had been so tough on them before. However, when they were in a funk during Rising From the Dead, Scary Murphy went back to her harsh attitude to force Cleo to take back her responsibility as the squad captain and fight her way back to the alpha fearleading position.
Scary Murphy wears a long dark purple coat with a dark blue witches hat. Her head is in a glass bubble, possibly a Gazing Ball, better known as a Crystal Ball used by fortune tellers.