The Gambler is the character found in the Madness Combat: Project nexus Arena Mode game.

He is a mysterious stranger whose identity is revealed in the fourth contract mission: Mandatus and is the primary merchant for the magical items used by the Magiturge.

he seems to be a projection of the Machine (but it has free will). They also talk in fucking riddles and it is sometimes frustrating because you don't even known what are they talking about.