Oh Effy. Effy, Effy, Effy. Tony's sister appears a few times in generation one (seasons one and two), but she really takes over the reins in season three, once her brother and his mates depart the series. Effy is a quiet character at first and doesn't speak at all until after Tony's accident, but it is the love triangle between Freddie and Cook and her destructive behaviour and diagnosis of psychotic depression following her parents' split that dominate her storylines. Played by Kaya Scodelario, Effy appears in 27 episodes, which is the most episodes of all the characters. Since wrapping, Scodelario has had plenty of starring roles. Most recently, she starred in the now-cancelled Netflix series Spinning Out, horror movie Crawl, and the Maze Runner franchise.