Ripper

Commander Ripper (リッパー中佐 Rippā Chūsa) was one of Morgan's officers at his base in the East Blue. After Morgan's defeat, he takes control of the base's operations.

Morgan Arc
He allowed 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 Coby, 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"