The Bloody Twins (ツインズ, Tsuinzu), Jiji and Djidji, are a pair of brutal serial killers that are loyal to Birds. As such, they are part of the Kokuyo Junior High Gang. They were first seen in the Kokuyo Arc where they were used to blackmail Tsuna, Gokudera, Bianchi, and Yamamoto; however, they were then defeated by Shamal's Trident Mosquito and Future I-Pin's Daisangen. They use their sharp fingernails to attack and they are very effective weapons as they can easily slice through hard objects.