Caesar Clown

Caesar Clown, also referred as "Master" by his underlings, is a former colleague of Vegapunk. According to Smoker, Caesar was a bounty hunter and  also the leading expert on mass-murder weapons.

Appearance
His appearance is that of a gassy vapour, however he does seem to be able to drink liquids as he is often seen with a cocktail glass.

Personality
He appears to have a grudge against Vegapunk, as well as a somewhat rational personality, as shown when he hid from the Marines instead of trying to fight them immediately. It was stated by Smoker (in Tashigi's body) that he was one "crazy bastard."

Abilities and Powers
Caesar being made of a vapor like form is able to float and go inside places that no normal being can as he was seen hiding inside some flasks when he was informed that the Marines were nearby. It is not yet confirmed if this is a Devil Fruit ability or something else.

History
Caesar was first seen on Punk Hazard after Franky and his group broke out of their cell, where he commented that only Vegapunk's laser was capable of such a feat. He was later seen commenting on the arrival of the Straw Hat Pirates and how Law was fighting the Marines.