What is a fanlisting?

A fanlisting is place where fans and supporters of a certain suject (movie, character, TV series, book, anime, etc.) from all over the world can be listed together. In this case, the subject is the relationship between Scar and Lust, two main characters from the popular anime/manga series Hagane no Renkinjutsushi, or Fullmetal Alchemist.

SCAR
Scar is introduced in episode 7 of the anime. He gets his name from the X-shaped scar that is on his face. He is an Ishbalan, and because State Alchemists destroyed his homeland and slaughtered his people, he goes on a killing rampage, exploding the brains of all State Alchemists he can find using his right arm. How his right arm is able to perform the alchemy is revealed in later episodes. His relationship with Lust is brought into light during episode 42.
LUST
Lust is introduced in episode 1 of the anime. She is a Homunculus, or an artificially-created human being. She seeks the Philosopher's Stone so that she can become a full-fledged human. While she seems ruthless and heartless at first, it is later revealed that she does have a soft spot.