Basically, create an ability! It can be for a champion that already exists whom you have a better ability for thematically or something for a non existent champion! List it's costs and everything about it. List the counter play to it and most importantly make it interesting! I look forward to seeing what we can come up with! The ability can be as broken as you want, but balanced ones that are interesting are nice as well! :)
Once had an idea for a passive change for 
if he gets reworked... It would be called "Brothers in arms".
Everytime an enemy kills your ally, they gain a stack (can't think of a name, so you tell me). These stacks can be up to 10 at max.
For each stack, the champion would gain 5% damage reduction towards THAT enemy (max 50% at 10 kills).
The enemy can't earn stacks if the victim is the champion itself, this only applies to allies. Assists don't count either, only the killer can earn those.
If the enemy dies, they lose half stacks is killed by an ally (In this scenario, the champion didn't assist even against said enemy).
If the enemy dies by either a kill or assist by the champion, all allies would win 30 gold extra for each stack the enemy had (Up to 300 gold at max stacks) and the enemy loses ALL stacks he had stored up, reseting back to 0.
This would make the 2nd best way to earn gold (First being 
) as assuming that the enemy would give 500 gold for being on a large spree, add the 300 and you get 800 gold yourself and 300 gold for each team mate.
Basicaly, this passive is meant to punish players that are ahead or on a legendary spree by rewarding the team with enough gold to catch up to said player. On the down side, I'd fear that this would make people feed a champion more to earn those stacks.
The whole concept is that if Teemo would ever get reworked, I was hoping he'd get reworked into an ACTUAL military captain, avenging the death of his allies by killing whoever's too murder happy on the enemy team, even if it meant a friend.
Talon passive:
"Shadowstrike" When Talon enters a fight from out of combat and deals damage before taking damage he gets and decaying 10% physical damage buff(works like assasin mastery in terms of damage amp) for the next 2.5 seconds(decaying in an negative accelerated curve).
Would like to, but an ability of a non-existing champion would need a lot of context actually
One for 
maybe?
W- Fox Fire. Passive: Ahri constantly has orbs of foxy energy floating around her, up to 3 at a time. They recharge at a rate of one orb every 3 seconds (reduced by cooldown reduction). For every orb she currently has, her AP increases by 3/6/9/12/15 (+ 4% of Ahri's current AP).
Active: Cost: 20 mana + 1 Orb Cooldown: 0.5 seconds Effect: Ahri launches one of her Orbs at the target enemy. It deals 10/20/30/40/50 (+20% AP) magic damage to the target, up to 30/60/90/120/150 (+ 60% AP) magic damage. Targets take 1% increased damage from the ability for every 1.5% of their missing health, up to 80% increased damage from the ability, up to 54/108/162/216/270 (+ 108% AP) magic damage.
