Ripper

First Appearance: Chapter 7; Episode 3

Commander Ripper was one of Axe-Hand Morgan's officers at his base in the East Blue. After Morgan's defeat, he takes control of the base's operations. He allows Luffy and Zoro to escape without reporting them to headquarters for ending Morgan's tyranny, and later puts himself (and his entire squad) on food restrictions for doing so. He is the one who also allows Koby, and forces Helmeppo, to join the Marines. He is unique among the marines in that he is stuck in the middle of "Absolute Justice" and "Moral Justice"

(Source: One Piece Wikia)