Scotch is one of the Yeti Cool Brothers. Alongside Rock they are assassins who were employed by Caesar Clown.
He wears a gas mask with lenses and canisters that are visible even from his silhouette.
(Source: One Piece Wikia)
Power
69 / 100
Speed
88 / 100
Technique
75 / 100
Intelligence
70 / 100
Cooperativeness
83 / 100
One Piece
Supporting
Sakuya, Shunsuke