Jedi and their Apprentices. They're the fulcrum around which much of the Star Wars saga rotates. The upcoming Spark of Hope set for Star Wars: Destiny brings more of those characters to your decks. So, you can pick up Yoda and add him. Or maybe pick up some Younglings (as opposed to Yuenglings). It's up to you.
From the post:
From Rey learning the ways of the Force from Luke Skywalker to Yoda training the Jedi of the Old Republic, the bond between master and apprentice defines the Star Wars galaxy. Success and failure is passed down from generation to generation, as apprentices surpass those who came before them and become masters themselves.
Spark of Hope continues the themes introduced in Convergence, including an emphasis on subtypes that put Jedi and apprentices on the center stage of conflict for Blue heroes.