Asch &Luke (watch out, spoilers!)
Luke is the main character, the only son of a noble family of the Kimlasca Kingdom. After a kidnapping incident, all of his memories were erased, causing him to be very selfish and ignorant of the real world. His only hobby is swordsmanship. Luke also possesses the ability to create a "hyperresonance" on his own, a sort of power that usually requires more than one person. As the game progresses, Luke learns that he is actually the "replica" (clone) of Asch, the real Luke Fon Fabre. This event, along with the abandonment of his friends, prompts Luke to change himself.
Asch is the original Luke fon Fabre. After being kidnapped by Van, he is replaced by a replica, while he joins the knights under the name "Asch". He originally goes along with Van until he begins to hate replicas, especially Luke, who has his identity.
What's a fanlisting?
It's a list of people who like squeeing at a paticular thing or topic, could be also a character like in this case. The idea is that the bigger the list, the more loved that topic or subject is. Also it's good to meet people who like the same things you do.