Here is a bio of the antagonist Hex.

Hex is basically a man that believe that he should rule the earth and have it in his image and will destroy anyone who would pose a threat to him.

Appearance

He also wears the coat to cover this

A robotic arm.

And when he had went through a tragic even he was chosen to become a yellow lantern. And here is his ring and outfit

And for a little thing to know his real name is James Sebastian.

Well that will be it for now I'll see you later