Your main now has Teemo's kit merged with his/her own (In matching order). How does it look?
My Main 
Mention: I had no plan to do this in a fan-ficy manner, and you are not required to either, but I started it on the passive and I felt the urge to do the whole thing this way, just for laughs.
Passive: Ezreal was walking through the river bush on his way to gank mid lane, when suddenly he heard a sensual whisper "Ezreal-chan, don't tell me you though you could escape my warm embrace by hiding in the jungle ;)" Ezreal suddenly broke into a cold sweat, which he knew would soon turn hot in the next few moments, as Taric's Bravado revved up with a nasty Toxic Dazzle
Q: Ezreal tried to escape, but a green glow soon followed and into two succive blows, he was now blinded, but he could still feel Taric's hands upon him "Also, I brought a friend"
W: _ Zoe Olaf walked in the bush, the binding of butt buddery Bastion now radiating over the handsome and hulking viking_ "Now what ever gift I give you, he will do the save, and we both can go in a little faster as well_
E: Suddenly, Ezreal heard the all too familiar sound of the Dazzle, coming from both sides, but unlike what usually happened, he was not only stunned, but a poison now coursed through his veins, weakening his will to resist. "And just so no one intrudes upon us..."
R: Taric lets down his heavenly radiance, but not only does this allow him and Olaf to become invincible to harm, but it also created a circle of toxic mushrooms around them both, making escape, and rescue, almost impossible "Now, it's time we got into action"
5 seconds later
has slain 
a blind bind from stealth?!?! Adcs can no longer outplay with autos and lifesteal.
Passive - You can run fast and if you stand still they can't see you
Q - The poison has become caustic to the point of blinding
W - Oriana's W without damage
E - Singed flip now applies poison. This does not appear to be useful.
R - A massive ball of stats that makes traps occasionally condense from his Q
Doesn't seem he would gain too much from it, besides the invis
passive: invisible egg. i am now unkillable.
q: blind is kinda pointless cuz it already stuns
w: now you cant run and im fast
e: this is already like half my damage, and now it also has poison. so now its a point and click ability that does like as much damage as a max range 
q
r: theres now a slowing damage over time mushroom in my slowing damage over time toggle ult. if you get hit by this youre probably dead. ez.
P: Get Mana from standing Stil, which also makes you invis.
Q: A Raven that blinds enemys hit, while doing a Dot.
W:Spawn a circle that roots enemys after 2 seconds while making allies inside it faster.
E:Applie a Dot, that withers(increses all dmg taken by 20%) and poisens the target.(His E also increses it dmg by itself while having a 1.0 scaling of right now.)
R: Transform yourself into a GIANT raven commanding tiny ones to suck the lifeenergy out of any targets nearby, healing swain while also badly poisining and slowing his enemys.
Permablinding cane sounds orgasmic
Wither and move quick
Spirit fire now applies poison dot
Ultimate turning Susan into a giant noxious shroom sounds pretty lit.
P: Ghouls are perma-invis
Q: Blinds + Damage
W: Wall that you move quick towards
E: Poison and slow instead of damage and slow
R: Maiden now leaves mushrooms every 4 seconds and slows
This would make him the absolute worst persons to lane against
passive: You can go invisible and gain attack speed when standing still.
**Q:**deals damage to all enemies with E passive and blinds them based on how many stacks they had.
**W:**throws a Cask of Poisonous gas that steals movement speed and applying a few stacks of your E to them over the duration.
**E:**Passive:Your autoattacks and ablilities apply a dot that stacks up to 5 times.
**Active:**throw down a small Mushroom that deals a small amount of damage and applies your passive, does not give vision.
**R:**Gain a massive amount of range and your autoattacks peirce applying your E to all enemies hit.
Passive: autattacks on a target root and blind them for 0.75 seconds this can happen to a target every few seconds.
**Q:**Passive: not taking damage while in the river you become camouflaged (much smaller radius for enemy vision).
Active: You throw a MASSIVE Blowpipe at the enemy confusing them (as for why you threw your weapon at them) while you realize you made a mistake and dash to their location to get it back dealing damage and stunning (due to both confusion and getting trampled).
**W:**gain a sheild, bonus damage on your autoattacks and you can attack while moving.
**E:**Litter the surrounding area with poisonus gasses applying a Dot to all nearby enemies that stacks up to 3 times if they get hit by multiple Clouds.
**R:**Fire a Mole to dig directly under your opponent and place mushrooms under them, follows them for a few seconds and slows non target enemies hit by the mole while he's underground.
**
Passive:** Whenever you die you Spawn a Whole bunch of mushrooms underneath you.
**Q:**You charge up your axe (well Blowpipe with a Blade really...) and them slam it down on enemies with earthshattering force, sending rocks, gravel and dust into their eyes if they are outside the slammed area, they take damage and get knocked up if they are in the slammed area.
**W:**Passive you gain out of combat movement speed by killing Stuff stacks infinitely (OH GOD WHAT HAVE I DONE) Active: this movement speed is no longer out of combat only for the next few seconds.
**E:**Laugh in a target direction Dealing damage and lowering magic resist, minions are Transformed into mushrooms.
**R:**Passive autattacks and mushrooms now deal a Dot in additon to their regular damage. **Active:**turn in visible and start slowly (like tahm kench with an enemy in his mouth) moving in a direction (you can change direction slightly) when you run into someone You Deal damage to them, stun them and create a mushroom ring around you both to deter running away.
passive: You recover sanity points (and Hp) by placing mushrooms down and having enemies run into them, also your other abilities do that too.
Q:throw down a Really Volatile mushroom in an area where it goes invisible after a few seconds, reactivate to deal damage to all enemies in the area.
W:Drink some mushroom juice taking reduced damage for a few seconds, after drinking your next autoattack Blinds and deals bonus damage in an area as you burp in their faces. (argh! my eyes! THEY BURN!)
Throw yourself in a direction dealing damage to enemies you hit and applying a damage over time to them for some reason.
R:throw a massive mushroom onto the ground, when an enemy steps on it it deals damage and knocks back all enemies in an area.
Passive: Becomes invisible when still, and after moving, he quickly gets all 3 stacks on them.
Q: His tongue hits them in the eye, slowing and blinding them.
W: Gains a burst of speed for a split moment (like .5 seconds, or .3 if he eats an enemy champ) after eating something.
E: After activating his shield, he poisons everyone around him.
R: Leaves a mushroom as he leaves and appears somewhere, because he's nice like that.
: While standing still or in bushes, her and her spiderlings are invisible.
Q: Human Form Q now blinds people and spider form Q reset the duration of the Blind
W: Volatile Spiderling poisons and slows all units in its blast radius. In spider form, W also grants bonus movement speed with her attack speed.
E: Units afflicted by cocoon cause a debuff that makes DoT deal bonus damage (liandry's effect). In Spider form, her Autos and Spiderlings after rappel do bonus DoT.
R: Melee units who kill spiderlings take bonus DoT, and all units within radius of a spiderling's death get poisoned.