Juxtaposeur

He's a rat from his psyche to toes
In most matters he'll likely oppose
His hair is slicked back
And he wears mostly black
Like a statue he's striking a pose.

Peter Lorre is sidekick to mobster Steve Cochran in The Chase (Arthur Ripley; 1946), adapted from  The Black Path of Fear by noir writer Cornell Woolrich. The story goes that Lorre was tired of playing villains, and took the part as a favor to producer Seymour Nebenzal, who also produced  Lorre's first success, M.