User blog comment:Kassyndra/Ling Zu, the Petal of the Dusk/@comment-6191229-20140309093724/@comment-6292556-20140309165958

Her main role is poking and initiate the finishing with her W when enemy's low enough. If you want to initiate quickly without poking, there's E+W combo. Her ultimate is for teamfight initiation/counter-initiation with silence and turns fight into her team's favor with passive sharing.

In short, she's a support who specialize in poking and assisting a kill.