Who is Sir Leon?! He's gotten such a bigger role!! He's almost in every episode. I want to know who he is!!!

Well Scar, I hope this doesn't only confuse you, but I think Sir Leon should probably be dead. In The Last dragonlord he was the first to volunteer to face the dragon, and all the knights got roasted, completely; I mean, the dragon dominated everyone except (here's a big surprise) arthur, who was conveniently unconscious and merlin, who was conveniently a dragonlord. (but আপনি gotta প্রণয় convenience) So yes, Sir Leon is slated (not just slated, he is) coming back for season three. But আরো importantly, he's coming back from the dead. :)

He's basically just one of the nights of Camelot that does all the errands around the kingdom that a knight needs to do.

Well ... Sir Leon, portrayed দ্বারা Rupert Young, is a knight of Camelot and something close to Arthur's সেকেন্ড in command. He first appears as a jousting partner for Arthur in "The Once and Future Queen" but pulls away when the Prince is blinded দ্বারা light. This causes Arthur to want to prove himself as a person, not just because he is Prince. Leon is later unhorsed jousting against 'Sir William' in the tourney.
In "The Last Dragonlord" he took control of Camelot's defence while Arthur was searching for Balinor. He is also the first knight to step অগ্রবর্তী at Arthur's request for a fighting force against the Dragon. During the battle he was either unhorsed দ্বারা Kilgarrah's tail অথবা caught in the flames. His actual fate is unknown.
It was revealed দ্বারা Johnny Capps, that Sir Leon will return in Series 3.