When you really like a champ's kit, but hate his voice lines...
(edited for clarity) Please allow for muting a champion when you play as them.
Case in point: i just started playing urgot. I really like his kit. its kinda OP, after all :) .. but his lines... i mean wth riot.. so freaking depressing!! If I play urgot too long I might just (---censored for trigger words--)
This feature would probably also be popular with the normal women players out there who might otherwise like playing certain champs COUGHEVELYNCOUGH but are really put off by their voice lines.
It could be a very simple UI change: just a radio button in the in-game sound menu, for "Mute [champion] voice". The champion would change to whatever you have actually selected to play. Then the choice would be saved in the same way that previous skin selection for that champ is saved.