Melissa is Spencer's older sister, who is engaged to Wren at
the start of the series, but later returns to Ian. A perfectionist and the favoured
daughter, she was Spencer's rival for most of their lives. Their competition
lead to Spencer kissing both Ian and Wren, which culminated in Melissa breaking
off her engagement with Wren. After the breakup, Melissa rekindled her
relationship with Ian and the two eloped, after which Melissa confided in
Spencer that she just wanted the fighting between them to stop. Shortly after
marrying Ian, Melissa becomes pregnant, which again causes a rift between her
and Spencer, who suspects Melissa is covering for Ian. When Ian goes missing,
Melissa refuses to believe Spencer's claims that he is dead, thinking that she
is receiving text messages from Ian, who is in hiding. After discovering Ian's
body, however, Melissa becomes depressed and apologizes to Spencer for choosing
Ian over her. Spencer and Melissa's dad's gun goes missing, and Spencer fears
Melissa took it. Although Melissa didn't take the gun, her parents still feared
that she killed Alison through jealousy. So her mom hired a private
investigator to watch her. Toward the end of the second season, Melissa makes
some odd statements that imply she knows some secrets about Alison and the
N.A.T. club. Melissa lost her baby after Ian died.
Shana is a clerk from the Rosewood Halloween Spooktacular
Store. She was introduced when Hanna saw Peter talking to her at bar. Peter
admitted that he had a thing with Shana during the summertime and that he was
trying to find information on who bought the Halloween costumes of the people
who attacked them on the train from Shana. It was revealed that Shana was the
mysterious person that Jenna Marshall was talking to in the finale of season 2
when she met up with her again in the finale of season 3.
Jenna is Toby's younger stepsister. Jenna was accidentally
blinded after Alison threw a firecracker into Toby's shed, intending to play a
prank on him. Jenna attended a school for the blind in Philadelphia before
returning a year later when Alison's body is found. This leads to conflicts
with the girls, who feel guilty about what they did to Jenna, and having let
Alison pin the blame on Toby. Prior to Alison's death, she and Jenna had been
rivals, after Jenna turned down Alison's offer of friendship. Jenna was engaged
in a power struggle with Alison before her death; after Jenna's accident,
Alison visited her and blackmailed Jenna with the knowledge that unknown.