User blog comment:Reilock/Season 4: History/Lore of the League: Thoughts/@comment-1836772-20131108221155

I'd say that Jayce's goal (and Zac's by coincidence) are to defend those who can't defend themselves, and more specifically to end Zaun and Viktor's unethical scientific practices. Thresh? He wants the strongest willed souls in Valoran so he can break them. And if you think Trundle's new story is bad, the point behind the lore change from the old one was because Riot wrote him into a corner, where he was shunned even by his own people.

Honestly, the goals and reasons for some of the older champions are less clear or make less sense, particularly for the six Offworlders (Nasus, Renekton, Morgana, Kayle, Taric and Malphite). They don't have any real horse in this race; they were pretty much forcefully conscripted into a tournament on an alien world for an indefinite period of time, and there's no guaranteed way to return to their own worlds, if ever (fortunately, they are addressing this issue in their lore reworks). Nocturne, Fiddlesticks, and Brand literally don't have an existence outside of the League and are imprisoned and forced to fight at the Summoners' whims, and their only goals are general death and destruction.

What about Sivir's motive? Why does she fight in the League when in her lore update she appears to be more interested in money than anything else? The logical conclusion is that League Champions get paid, if not in money then access to the Institute of War's resources and/or services (Ryze, Xerath, Maokai, Zilean, and possibly Rammus and Twitch).

Finally, there are some characters whose motives are a complete enigma, specifically Jax. If he really is the previous High Councilor of the League, then why did he make himself disappear and assume the role of Jax? Why is Gragas in the League if his goal has almost nothing to do with magic or politics? Is this just something he does while drunk?

It's a little narrow-sighted to look at what's been introduced in Season 3 for frays in the plot, but sadly, in the end, most players don't care about the champions' backstories.