Lux is Gragas Confirmed

Lux is secretly Gragas in a future time.

Gragas is always seen with alcohol, so we can assume he is a heavy drinker. What happens when you are a heavy drinker? You can suffer from alcoholism. Symptoms? Depression is one. Gragas always seems happy, but secretly he is depressed. He found that he needed to get rid of his drinking problem. When you drink to much, you can have a hangover. What is the worst thing when you have a hangover? Light! Light. http://imgur.com/N1UvWLV

So Gragas knew he had to turn to the light. Gragas' newfound cure was wonderful. He felted changed, but he didn't looked changed. He needed a way to represent his new "him". What better way then to change his appearance? But look! You might not have seen it before, but Shen is on Gragas' friends list! http://imgur.com/aqtaL39

Gragas called up Surgeon Shen! It all makes sense. Shen is a ninja, ninjas can't be seen, and Gragas wanted his past self not to be seen. So clad in his mystical crocs, Surgeon Shen turned Gragas into his true self... http://imgur.com/Xs3dkxw

Even their abilities are similar! Both of them have a circular bound damaging spell. Both of them have a linear skill shot CC. If Gragas uses his E to proc his passive, both of them have a defensive self castable ability. Even their ultima

But then again, if you believe the Leblanc is Lux theory that means Leblanc is secretly Gragas.