Ah League of Legends, a game that started as almost nothing and has expanded into such a loving and caring community. {XD}
Jokes aside, I've been playing this game since late Season 3, and have pretty much been playing it on and off ever since. Playing Ranked in Season 4 has almost completely put me off the competitive environment, so I've just played Blinds since then or URF whenever that's up.
As for my favourite champions... Oh boy, where do I even begin? I don't necessarily have a single favourite champion, as I play fill and generally play all sorts of roles. But, being a fill main, that's meant that most of my games are spent as Support, and I pretty much like to play all of them bar a very few champs (Blitz/Thresh feel too cheap for me and Taric/Alistair are just boring). I can safely say that my weakest lanes are top/jungle though, so the champions I 'like more' than others tend to be your standard AP mages/supports as well as tanks such as Sejuani and Leona.
EDIT: And oh yeah, I am SO ready for Star Guardian Soraka. I kinda don't like her Reaper/Program ones, and the others are sort of mediocre due to their old age. Order of the Banana always gets a few giggles out of me though.