Riot recently released a short story called "The Bird And The Branch", heralding the arrival of a new Champion called Taliyah -- a stone mage from Shurima who falls under the guidance of Ionian Champion Yasuo. While her abilities and splash have yet to be revealed, the story shows that Taliyah already fits into League's once-neglected lore better than a number of recent Champions have.
Tagged With champion reveal
Part of it legitimately says 'boop'.
In most games having half an hour of dialogue isn't a big deal, but you have to remember that League of Legends isn't exactly story heavy. New champion Aurelion Sol's dialogue therefore comes with half an hour of taunts, battle cries and odd noises (including three variations on 'boop').