How come nobody here brought up Brand? I wouldn't say he is THE LoL villain, but hey he is one of those men who want to watch the world burn. But anyways. THE Villain would have to be Swain. While the others are big maybe even bigger threats they're are not the constant villain. Swain and Noxus are the main villains. Think comics. Batman has The Joker, Supes has Luthor Spider-Man has Green Goblin. Sure lots of other villains come and go (Voidlings like Cho, Herc from the Shadow Isles, Viegar the comedy relief villain etc etc) but the main threat to the "good guys" who to me is Demacia is Noxus who is now led by Swain. Just my opinion anyways thinking from a Demacia/Jarvan viewpoint lol.