Break a Champion
Make a champion ridiculous by making only 1 minor change to their kit.
Example...
: Kindred's Q now applies on-hit effects. (Which includes her passive.)
EDIT: Holy Guacamole! This thread blew up like an atom bomb, I even saw it on the Boards' front page.
EDIT 2: A lot of you guys are misunderstanding the spirit of the thread. I get that "Nothing because X champ is already broken" is a joke, and that's fine. However these are supposed to be 'small' changes, the tiniest changes that would make the hugest difference.
Here's another example that was made in the thread...
: Nami's W continues to bounce until it has no other target to bounce to that hasn't already been hit.
W now heals off turret.
taunts enemies poisoned by him.
Has a real weapon.
: Event Horizon instantly summons a cage at a target location.
Nothing
dies.
D-Did I do it right? Is he not broken?
's R resets on kill and assist
can proc her own passive
Siphoning Strike passively gains 1 stack every 10 seconds.
can give allied champions mana
R: No limit to number of stacks
dw guys I got late game, let me farm FOREVER
or 
ult now allows you to attack the enemy while they are in stasis.
Q now applies a AFK warning on screen.
Ultimate ignores terrain.
mandrops instantly
E is a toggle
OH WAIT
Alpha strike has a 1:1 AP scaling :^)
Defensive Curl now reflects 100% of all damage taken back to the attacker as True Damage.
Rework Reverted
Frostbite works on Chilled targets the same way Twin Fangs works on Poisoned targets.
Drain is no longer a channel.
Stealth now only breaks if she attacks a unit.
Ult snares at the end of the duration
Q can now bounce on the same target consecutively.
R isn't affected by CC
E has his 1 seconds silence back (god help us all)
Reduces his cooldowns each time he strikes an enemy champion.
has her Season 1 passive back (Gains bonus AP per point of AD, gains bonus AD per point of AP)
If you kill the 'real' LeBlanc while her passive is going, the clone becomes the real LeBlanc.
Blight stacks have no limit.
Can now eat ANY unit, that includes turrets.
Q now slows all enemies hit.
Passive no longer has a cooldown.
No max turret limit
W now reduces the cooldown for W as well as his other abilities.