Tweak abilities however you want to make the champion horrible!
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Teemo:

Passive:Causes Teemo to be pinged on the minimap for all players to see when he is moving. When standing still he looses the ability to attack for 20 seconds

Q:Now blinds Teemo causing him to hurt himself in his confusion
His attacks when blinded do 50/70/90/100/150 damage to himself and poisons for 100 over 10 seconds

W: Teemo looses 10/20/30/40/50% attack and move speed.

E: Every attack heals a nearby enemy champion for 30/40/50/60/100(+30% AP) over 10 seconds (Imagine an actual ability like this: passively heals a nearby champion for 2/5/10/15/30(+1 per 10 AP) on every attack... Support ftw!)

R: Plants a mushroom that detonates after 1 second healing all enemies globally for 200/400/600(+100 per 1ap). Teemo passively stores 0 mushrooms and regains one every
700 seconds
horrible!
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Teemo:
Sion:

Q: Stuns for .1 second and deals 10/20/30/40/50(+1% AP)

W: Does the same as his normal W but can only cast on enemy minions. The shields from this shield for 300/499/586/670/900 and damages all minions on sion team for 10/10/10/10/9001

E: Every attack hurts sion for 50/60/70/100/150. Killing a minion lowers sions health by 5.

R: Lowers all allied champions attack speed by 50% for 20 seconds
horrible!
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Teemo:
Master Yi

Passive: Can't use any abilities or attack. Gains 1 move speed and 10 health every second.

Q:Alpha strikes all units on the map doing 7000% AP

W:Kills all units, towers, and inhibitors on the map. No further units spawn.

E: Increases attack damage by 500/800/1300/1900/6000

R: Changes the map. Each level you unlock a new map to change to. Twisted free line/howling abiss/summoners rift

Shaco:
Removed the stealth and blink from his Q
His boxes are now already activated when placed.

RIP Shaco, see you in hell f*cking jester.

Kennen now needs 30 marks to stun the target instead of 3, and the marks vanish from the target after 3 seconds. Also he is now immobilized and takes 50% more damage from everything during his ult.

Akali's energy meter is immediately drained upon using one spell. Also, it regenerates by 1 every minute.

Fiddles' Q now fears himself

Darius
Passive - Slowly bleeds to death over time
Q - When he spins he gets dizzy and attacks the closest ally (himself if no ally around).
W - Gets a hemorrhoid, Damage over time to himself.
E - Pull range decreased to 10.
R - deals 1 True damage (if the enemy is Darius, deals 10,000 true damage). If the enemy dies, so does Darius. If the enemy lives, Darius dies.

Heimerdinger -



Oh wait, never mind, Riot beat me to it.

Udyr

Can only be played by Summoners named Siyanor

Garen:
Q,W,E,R And Auto attack heal the enemy and harm himself.