I thought I saw a sign, somewhere between the lines
Sydney Mikaelson has known Michael Clifford and Calum Hood since they were children and she and Michael have always been practically joined at the hip. She's known among fans of the band as the unofficial fifth member and the boys mention her frequently in everything they do.
During their latest tour, it's obvious Michael misses her and the other boys concoct a plot to get them together officially. Meanwhile, when Sydney finally does arrive, she helps Cal and Mikey concoct a similar plot for Ashton and Luke.
"Syd's platonic soulmate; has a crush on Luke, but hasn't told him; drummer; oldest of the five of them."
"Met Syd when they were ten, they've been friends ever since; constantly tries to talk Mikey into telling Syd how he feels; adorable puppy of the band."
"Views Syd as an older sister; has a massive crush on Ashton but has only told Syd about it; general cutie pie."
Sydney's best friend since age seven; has a crush on her; professional dork and guitarist.
"Unofficial fifth member of the band; loves all of the boys and has a huge crush on Michael."