The new trailer for Star Wars: The Last Jedi is as great as a fan could hope for, offering numerous tantalizing glances at the next chapter in the sci-fi saga. But while most every character's story is fairly well developed, for the most part Finn remains a cypher. After getting his back sliced up by Kylo Ren at the end of Force Awakens, we know he and new character Rose will going to rally for the Resistance, but what if there’s more to his story than that? Namely, what if Finn's story involves him finding his family?
Family has always been a big thing in the Star Wars universe, even outside of the exploits of the legendary Skywalkers. In Force Awakens, their shared lack of a genetic family is what unites Rey and Finn, even as families are both born and destroyed around them. Finn, specifically, is involved in the destruction and creation of families. He’s an outlier from other Stormtroopers in the First Order in that he cared for others in his squad, something viewed by Captain Phasma as a weakness. When he defects at the start of the film, he’s met with cries of “TRAITOR!” by his former friends. He shattered his First Order “family” and subsequently formed a new one with Rey, Poe and other members of the Resistance.
Throughout Force Awakens, Finn and Rey’s personal journeys mirror one another, so much that the film didn’t reveal who the “true” Jedi between them was until the it hit theaters. (And even then, only during the second act; prior to that point, the movie is appropriately cagey in regards to which one of them Snoke is referring to about an “awakening.”) Because Daisy Ridley and John Boyega have enchanting chemistry throughout the film and play the youngest characters -- Rey is 19, and Finn is 23 by the time we meet them -- it’s easy to see why the film lets their storylines play off each other.