Guren (prisoner)

was a prisoner at Orochimaru's north hideout. He received a cursed seal in the course of Orochimaru's experiments. When activated, the seal resembles vines as it spreads across his body. In its level two state he grew wing-like protrusions from his forearms and a broad flat tail. He was unable to suppress his fighting instinct and brutally killed a number of fellow prisoners during his escape. He was soon afterwards defeated by Sasuke Uchiha.