Can you briefly describe Finn's story arc in Star Wars: The Force Awakens?

Finn goes from being a First Order stormtrooper to a rebel. He deserts the First Order after a traumatic event and joins forces with Rey.

Finn's story arc is quite interesting. Initially, he is a stormtrooper in the First Order, following orders without question. However, during a mission on Jakku, he witnesses the horror and inhumane actions of the First Order. This makes him question his allegiance. He then defects and teams up with Rey. As they journey together, Finn faces many challenges. He has to overcome his fear of the First Order, which he was once a part of. He also has to learn to trust his new allies. His arc is a journey of transformation from a cog in the First Order's machine to a hero fighting for the Resistance. He has some great moments, like when he tries to take on Kylo Ren to protect Rey, showing his growth in courage and loyalty to his new cause.

Finn's story arc in the movie begins with him as a loyal stormtrooper. But after seeing the brutality of the First Order, he decides to flee. He meets Rey and they end up in the middle of the fight against the First Order. His arc is about finding his true self and standing up against the wrong side he was once part of.