This is my first, guide. I created it to prove how easy it is to go fizz mid in ranked.
Simple as that. Im trying to keep the guide easy not so much to read through.

Feel free to say if you think i should change something, but you can't just say like say "changed that" please explain why i should change it..

Centuries ago, an ancient water-dwelling race built a hidden city beneath a mountain in the sea. Though these creatures had their enemies, the city was an impenetrable fortress, and, in the safety it provided, they grew complacent. Fizz, however, harbored a curious spirit that could not be satisfied living so cushioned a life. Unable to resist the allure of danger, Fizz had a habit of sneaking out of the city to look for trouble. In his many adventures he grew to be a powerful fighter with a keen resourcefulness that let him skirt danger with clever ease. One day, Fizz returned to find the city abandoned: his people had vanished, leaving Fizz without a clue to explain their disappearance. With nothing left in the city to keep him, Fizz salvaged an enchanted trident from the ruins and set out alone.

For years, Fizz wandered the ocean, using the skills he'd learned during his adventures as a young boy to survive. Finally, Fizz discovered the port of Bilgewater. He was fascinated with the existence of life above the water and could not resist exploring the island. In his endless curiosity, Fizz inadverently meddled in the affairs of the humans who lived there and his presence did not go unnoticed. His mischief angered many residents who eventually sought to capture or kill him. Fizz found himself cornered, and he prepared to return to the sea despite the fondness he'd come to hold for Bilgewater. As he stood at the docks, a massive dragon-shark attacked the port. Fizz defeated the beast, using his resourcefulness and knowledge of the creatures' weaknesses to his advantage. Having earned the gratitude and respect of the humans, Fizz decided to stay in Bilgewater. He joined the League of Legends to further serve his new home.

''Fizz makes even the saltiest sailors of Bilgewater look like drunken landlubbers in a fight. Good thing he's on our side.'' -- Miss Fortune, the Bounty Hunter.

Fizz is the perfect champ for mid, cuz he can dodge attack easly with his "E" and nuke them fast. He can also avoid gank easy with "E"

PROS
High nuke already at lvl 3
Awesome towerdiver
Ulti ap ratio 1.0
Can avoid ganks easy
Strong harass

CONS
Hard to master
Squishy
Weak before lvl 3

It's hard to nuke champ at level one, so let they think they have control over you. Just play abit defence untill you hit about 3-4, then you jump to him with "E" put your ignite and activate "W" now you should just probably end him with "Q".
It is now you have control over mid, even if they "towerhug" you can still kill them easy.
activate "W" jump in with "Q" and out with "E".
Remember to keep the farming up last hit and etc.

I choosed these to get good nuke but still have the survibility. Took the 2% attack speed (alacrity) for better farm and early dmg.
I took 2 health regen per 5 seconds (vigor) so i dont loose to much health at the beginning when im letting them push.

Mark help you nuke people with MR better..
SealGood late game ap nuke..
GlyphGood late game ap nuke..
QuintessenceGood early game ap nuke..

I choosed these item too get a good nuke at start and some defence at late.This one will give you a great nuke early game, so go that after dorans ring!

Flash too catch up with enemys or too flee from them
Ignite just help you nuke them even faster
Ghost This is also very good, depend on how you wanna play

Q: Urchin Strike

Fizz dashes through his target, dealing normal attack damage plus 10 / 40 / 70 / 100 / 130 (+70% of ability power) as magic damage. This ability can trigger on-hit effects.

W: Seastone Trident

Passive: Fizz's attacks rend his enemies, dealing 30 / 40 / 50 / 60 / 70 (+35% of ability power) plus 4 / 5 / 6 / 7 / 8 % of the target's missing health as magic damage over 3 seconds. Max 300 vs. minions.

Active: For 5 seconds, Fizz's attacks deal an additional 10 / 20 / 30 / 40 / 50 (+35% of ability power) magic damage on hit and apply Grevious Wounds to his target, reducing incoming healing by 50%.

E: Playful / Trickster

Fizz hops toward your cursor onto his spear, becoming untargetable, and then slams the ground dealing 70 / 120 / 170 / 220 / 270 +(75% of ability power) magic damage to nearby enemies and slowing them by 40 / 45 / 50 / 55 / 60% for 2 seconds.

Reactiving this ability while Fizz is on top of his spear, causes Fizz to jump again towards your cursor and deal 70 / 120 / 170 / 220 / 270 +(0.75 of ability power) magic damage in a smaller area to enemies nearby, instead of slamming the ground.

R: Chum the Waters

Fizz releases a magical fish toward a location that can bind itself onto enemy champions, slowing their movement by 50 / 60 / 70%. If the fish misses an enemy champion, it will remain on the ground for a brief time, binding to any enemy champion walking over it.

After 1.5 seconds, a shark erupts from the earth, dealing 200 / 325 / 450 (+100% of ability power) magic damage in a large area, knocking up the target the fish is attached to, knocking other enemies aside and reducing the movement speed of all enemies hit by 50 / 60 / 70% for 1.5 seconds.

And the passive:Fizz's dexterity allows him to ignore unit collision and take 4 / 7 / 10 / 13 / 16 / 19 less physical damage from basic attacks.

AS Fizz is acutally really good cuz of theSeastone Trident.
This build has worked good for me with awesome dmg. The armor and magic resist help well, even late game. Will uppdate this when i have more information, but untill then please try that build really works well.

I choosed the haste rune to help the nuke early game.
And some magic pene to make the Seastone Trident hurt even more.
Rabadon's Deathcap make you dmg better i recommend it strong.

I just wanted to show how you can play Fizz mid and i suggest you to try this guide cuz the dmg is insane the whole game.

Will add more when ive got time..