Nezumi

Captain Nezumi (ネズミ大佐) is a Marine Officer of the 16th Branch, in East Blue. His appearance and manners are rodent-like ("nezumi" is Japanese for both "mouse" and "rat") and he appears to be arrogant and decidedly corrupt. Nezumi accepts bribes from Arlong in exchange for keeping Arlong's crew out of Marine jurisdiction. Acting on a tip from Arlong, he uncovers the treasure that Nami had been hoarding in order to buy back Cocoyashi Village, and confiscates it from her. Once Arlong is defeated, Nezumi attempts to intervene against the Straw Hat Pirates but is quickly defeated. Then Nami quickly attacks him with her staff for destroying the orange grove and shooting Nojiko. She then forces him to return the stolen money, rebuild Gosa Village, and clean up all the mess left over from Arlong's reign.

The report he gives to his superiors on the incident prompts the Marines to assign Luffy with his first bounty. However, he wasn't pleased of the wanted poster picture because the picture doesn't make Luffy look dangerous.