Finn was a human male who served as a First Order Stormtrooper, designation FN-2187 and known to his fellow soldiers as Eight-Seven. He was considered one of the group's best stormtroopers before he deserted to join the Resistance in their struggle against the First Order.
Having left the First Order, he took on the name “Finn” at the suggestion of Resistance pilot Poe Dameron, based on his stormtrooper designation, having never been given an actual name. After leaving the First Order, he briefly wielded the lightsaber that once belonged to Jedi Knights Anakin Skywalker and Luke Skywalker.
During the Battle of Starkiller Base, he used this weapon to fight Kylo Ren but was quickly defeated and severely wounded.