From the Super Mario Wiki
The Factory Chief is a purple Ninja who supervises the productive forces of Smithy's Factory in Super Mario RPG: Legend of the Seven Stars. He is the strongest supervisor and the second-highest official of Smithy's management staff, below only Smithy himself. He attacks with very strong physical attacks, including Thornet and Funguspike. The Factory Chief also creates the weapon known only as Gunyolk. The Factory Chief and his creation Gunyolk are the last obstacles before Mario and his allies can challenge the main antagonist of the game, Smithy.
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