The titles says it all. Your favorite champion now has their passive reversed. Mine is Twisted Fate so I guess when he kills an enemy, minion, or monster, he gets 1-6 less gold. Not bad.
EDIT: I did not expect this thread to get this much attention. Thanks guys and all of these are hilarious.
Each hit takes away his fury until he becomes a total pacifist....
"Valor!? Why are you marking me!?!?!? VALOR!"
becomes 
until he stops moving for 2 seconds.
Every 4 spell casts, a voidling spawns a Malzahar?
Ashe's crit chance starts at 100%. When she doesn't attack it drops by an amount depending on her level until it reaches her natural crit chance. Her next attack resets her crit chance to 100%.
Can this be a thing?
All enemies are stunned until you hit them 4 times. Not bad.
When kat gets a kill, all her cds increase by 15 secs. Gg
Karthus goes into his death state when he revives?
Rengar's basic attacks while in bush/ult cause his opponent to leap to him?
Heheheheh....
Garen degenerates .4/.8/2% of his max health per second when out of combat...
'Upon being alive, Anivia will revert into an egg. If the egg can survive for six seconds, she is horridly scrambled.'
RIP Eggnivia 2014
"GET THESE SOULS AWAY FROM ME!"
viktor gets a negative hexcore that he can downgrade in order to lose 500 mana and 168 ap at level 18 when fully downgraded...
Miss Fortune becomes the slowest champion in the game :(
now makes you isolated around allies.
Ohhh yessssss
######and then you know, you do less damage when hidden, but hey....
Temper Tantrum - After casting a spell, Alistar beats himself up as well as anything near him for 3 seconds.
Healing Fire - Brand's spells lights his targets ablazing, healing 2% of their maximum health per second for 4 seconds. -- Alternate: Lights himself ablaze... or both D: Gragus so jelly.
Reincarnation - Upon death, Zyra turns into a normal human being for 8 seconds, then dies. Murderer...
Man Mode - Basic attacks and Audacious Charge challenge Xin Zhao, reducing his armor by 15% for 3 seconds.
Wussy Vest - Whenever Vi damages a champion with her abilities, she takes damage equal to 10% of her health.
Loose Ends - On every 4th ability use, Malzahar summons a voidling that attacks him. (clearly he's outlived his usefulness to the void)
Humanborn - Is no longer a badass dragon.
Reign of Happiness - Renekton gains 50% less fury from all sources. Starts hugging puppies.
All of Ashe's auto-attacks are critical strikes. If Ashe has not attacked in the last 3 seconds, she gains 4 / 5 / 6 / 7 / 8 Focus stacks per second. At 100 stacks, Ashe will not critically strike on her next basic attack. Thereafter, Focus stacks will reset to 0.
Ashe is finally viable! Hooray!
Heimer just slowly does and slowly kills allies
When a minion or monster kills Varus , the minion or monster gains 20% attack speed for 3 seconds. When a champion gets a kill or assist on Varus, the champion gains 40% attack speed for 6 seconds.
decreases range as she levels
well damn
would then be the easiest champ to kill and would have to avoid last hitting minions.
Ryze: When Ryze uses an ability, the rest of his cooldowns go up by 1 second.
Nunu: After every 5th autoattack, Nunu's next spell costs mana (wtf)
and my favorite: Evelynn: Evelynn is always stealthed until she is out of combat for 6 seconds. Buy those pink wards.
Master Yi - after every 4th auto attack, he doesn't attack
Azir - Gain CDR when buying attack speed or lose attack speed when buying CDR you can raise enemy turrets from destroyed ones and the health of those turrets increase over the course of 1 minute (at least you get 50 gold for taking it out >_>)
I was going to go with rumble (Begins full overheat and loses heat per cast in order to fuel his abilities).
Buuuuut since Rumble is more of a mechanic than a passive I will go with Wukong
Glass Skin - Wukong's armor and magic resistance are decreased by 4 / 6 / 8 for each visible nearby enemy champion :(
When Blitzcrank hits 20% hp, he dies.
Teemo is invisible until he stands still for 4 seconds.
Evelynn is only visible when not seen by champions or true sight.
Rumble's heat builds passively, only draining on spell casts.
Viktor now has 6 item slots.
Rengar leaps away from his target when coming out of brush or stealth.
Fizz takes increased AA damage.
Skarner's auto attacks will only not stun their target if he has already hit them with 3 spells.
Jax is now a lazy bum.
Now he is set on fire and loes 8% of his max health each second when hit by enemy abilities...oh dear lord help me
When 
dies he instead gets back up, gaining health back every second but losing it when he attacks. I can live with that - forever. :D
Malzahar always has a voiding up but on every 4th ability cast it disappears temporarily.
Miss Fortune gets much slower out of combat
Shaco gets bonus damage on ever side of a champion except the back/ Shaco does less damage against an opponents back
Maokai - Lose 7% of you max health on your next autoattack when passive is up. Well crap.
Shen - Every 8 seconds, Shen's next attack does way less damage.
Darius - Darius aims his attacks really freaking weirdly, causing his target's wounds to stop bleeding. This effect stacks up to five times.
Nurse Darius skin next.
When Volibear rises above 30% health, he loses 30% health over the next few seconds
When Malphite is out of combat for 10/8/6 seconds, he loses 10% of his max health.
Singed: your maximum health is reduced by 25% of your maximum mana.
Poppy: whenever she takes damage over 10% of her current health, the damage is doubled.
My personal favorite: Anivia is an egg and cannot move. If she is killed, she hatches and can cast spells. if she is not killed again within six seconds, she turns back into an egg (LOL WUT).
EDIT: Lucian: After casting a spell, his next auto attack deals 50% damage (Rito pls?)
- Every few shots, Caitlyn's gear horribly malfunctions, completely missing the target.
- Standing still builds up Yasuo's shield. However, he only gains 1/2 crit chance (Crits deal 10% more damage)
- Nami's spells and abilities slow her allies because they're drenched with water.
- Shaco deals bonus damage when facing his enemies.
- Using Vi's ablities causes her body to be strained, dealing damage to her.
Every spellcast in Spider Form spawns an infant. When in human form, the infants will follow you around, throwing things at your enemies.
and his allies level up slower...
Syndra cries.
leaps at you everywhere except brushes. Because hunters hate hiding.
Fiora loses 7 + (Fiora's level) health over 6 seconds each time she is hit. Striking champions will cause this effect to stack up to 4 times.
At least it would make her dagger meaningful. She'd keep poking herself with it. To death. "ONE STEP AHE-" "Executed."
Yasuo's feet get bruised when he walks too much and loses health when he reaches 100 Flow
Karma - empowers her spellshield
NERFS the entire team.
Ezreal loses 10% attack speed for 6 seconds. Oh god. Jinx loses movement speed on kill/assist/killing a tower/inhib.
