Hi, this is my Fizz build. I've decided to write this guide because I've noticed that none of the other guides rush Lich Bane, in my opinion Lich Bane is the strongest item on Fizz because Urchin Strike triggers it, which adds a great deal of damage to the nuke, compared to just having a bunch of AP.

I personally don't like AD on Fizz because he is squishy, i don't want to be auto attacking, if i'm auto attacking then i'm probably being auto attacked, and for example a Tryndamere or an Olaf would probably beat Fizz up if it's an auto attack battle. But it doesn't have to be.

Pros:
Insane damage.
Great mobility due to Playful / Trickster, Nimble Fighter and Urchin Strike
Can avoid a lot of DMG/CC with Playful / Trickster
Has DoT abilities. No luckers!
Fun to play.

Cons:
Squishy
Not an amazing farmer like Morgana

The masteries are up to personal preferences I like Good Hands because I don't like being dead in late game 5v5. I chose the points in Offense to get the most damage output as possible early game that will help you defeat your lane opponent.
The AD Offense masteries could easily be substituted by Defense, or more points in Utility.

I use Flash and Ignite. I use Flash because it's still amazing. Ignite to add some extra damage to your nuke, this works well with Seastone Trident for some nasty DoT. Exhaust is also a great option. Because Fizz already has a built in Ghost, and
Flash effect, it is not as risky to leave them out of your build.

I start with a Sapphire Crystal and 2x Health Potion then I buy Sheen and Boots followed by Sorcerer's Shoes and Lich Bane as soon as possible.

The core of my Fizz build is Sorcerer's Shoes and Lich Bane. The rest of the items depend on your personal preference or how the game is playing out.
For example if you keep dying, you should consider getting Rylai's Crystal Scepter But if you are destroying the opposing team maybe Mejai's Soulstealer is something for you. Rabadon's Deathcap is an excellent choice for an AP boost if you are lacking power. If you somehow aren't able to get Blue Buff, or you feel that your cooldowns are too long, you should buy Morello's Evil Tome.

I take Seastone Trident at lvl 1 for a hard hitting poke, Playful / Trickster at lvl 2 for mobility. then I take Urchin Strike at lvl 3.

This is when you can start destroying your opponent, use Seastone Trident then Urchin Strike to move in and deal a lot of dmg, then use Playful / Trickster to avoid their nuke and get out, or finish them off, depending on their remaining health.

I max Seastone Trident first, then I put a point in Playful / Trickster to reduce the cooldown. After that i max Urchin Strike for more damage. I mainly use Playful / Trickster as an escape. If I use it as a source of damage I may find myself trapped, if I'm not able to finish off my opponent.

Fizz isn't a bad farmer, but he's not the best either. Luckily, it's easy to last hit minions, because of the passive from Seastone Trident, later in the game with Playful / Trickster you can easily clear a minion wave fast.

Fizz is squishy during all phases of the game, but he is very powerful, when you reach lv3 you should be able to kill your mid lane opponent.

You should be mid or bot lane with a babysitter. It is possible to jungle as Fizz too.

Harass the enemy by poking with Seastone Trident.
When your opponent is at about 50% HP, you should be able to finish him off, use Seastone Trident then engage with Urchin Strike if this doesn't hurt them enough for Ignite to kill them, escape with Playful / Trickster otherwise, use Ignite.
If you don't do enough damage to kill your opponent yet, then wait until you have Sheen your damage will be much higher.

In teamfights it's your job as an assassin to jump in and kill a squishy target like Ashe or Cassiopeia, then get out before you get targeted, then get in to kill another squishy target.

Chum the Waters works really well if you manage to smack it on someone in the middle of their team.

Ignite should be used on champions that heal during the fight.

Remember to wait until your tank has engaged, you don't want to be targeted.

There are a few cool tricks with Fizz, you can use Playful / Trickster the same way you can use Bushwhack / Pounce, this means Fizz doesn't necessarily have to use Flash but i would still recommend using Flash.

When using Chum the Waters you want to aim behind your enemy, this makes it easier to land the spell.

If escaping or if you need to catch up with a target you can use Urchin Strike on a minion, the same applies if you need to escape.

When you jump with Playful / Trickster you can use the second part of the spell to jump back if you realize it was a bad idea.

Fizz is a really cool champ, fun to play.
He deals a lot of damage when you get Lich Bane.
Please comment, your opinion matters!
If something is missing, or there is a spelling mistake, do tell.