This is my normal build, and I can proof that it is good. Your early game is quite weak, but you will scale great into the lategame, and the amount of pain you can do lategame is actually really good.
This build is good for; the player who likes to go head on to into the enemy team.

Ult damage = 192 AD 600 base 876 AP = 1664

Pros:

Powerfull lategame
Great sustain
Huge amounts of damage

Cons:

Weak earlygame

This is my build when i feel like being an anoying slice of pie, that can eat you, but doesn't have the amount of health needed to sustain in a longer fight.
This is the build for; the player who loves waiting around for a teamfight to start, and then wait a bit before diving in for a cuple of kills, and then diving out, before diving in again and trying for the pentakill

Ult damage = 120 AD 600 base 897 AP = 1600

Pros:

Huge amounts of damage
great mid- and lategame

Cons:

Low sustain
Bad earlygame

This is my build when i feel like being an anoying slice of pie, that can eat you, but doesn't have the amount of health needed to sustain in a longer fight.
This is the build for; the player who loves waiting around for a teamfight to start, and then wait a bit before diving in for a cuple of kills, and then diving out, before diving in again and trying for the pentakill
This is a troll build, but a viable one of its kind

Ult damage = 120 AD 600 base 1519 AP = 2239

Pros:

Huge amounts of damage
great mid- and lategame

Cons:

Low sustain
Bad earlygame

This is my build when i feel like being an anoying slice of pie, that can eat you, but doesn't have the amount of health needed to sustain in a longer fight.
This is the build for; the player who loves waiting around for a teamfight to start, and then wait a bit before diving in for a cuple of kills, and then diving out, before diving in again and trying for the pentakill
This is a troll build, and people will hate you in solo que so please do only use this in 5v5 premades

Ult damage = 1395 AD 600 base = 1995 damage

Pros:

Huge amounts of damage
great mid- and lategame

Cons:

Low sustain
Bad earlygame