<Tr> <Th> Status </Th> <Td> Alive </Td> </Tr> <Tr> <Th> Seasons </Th> <Td> 1--7 </Td> </Tr> <P> Mona Vanderwaal is a fictional character and main antagonist in the Pretty Little Liars book series by Sara Shepard and its Freeform television series adaptation . In the TV series, she is portrayed by Janel Parrish . </P> <P> Introduced as Hanna Marin's best friend, Mona is revealed to be the first and original "A", initially harboring a grudge against the protagonists, using her intelligence and resources to torment them anonymously . In the third season of the TV series, Mona gains a partner who eventually takes control from her . Afterward, she forms an unstable alliance with the protagonists, becoming a victim of her own creation . Considered the most knowledgeable character in the series, Mona is versed in computer hacking, foreign languages, singing, empathy, and manipulation . Though introduced as a villainess, she eventually takes steps toward redemption . </P>

Who is a in pretty little liars mona