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 grows wing-like protrusions from his forearms and a flat tail. He is unable to suppress his fighting instinct and brutally kills a number of fellow prisoners during his escape. He is soon afterwards cut down by Sasuke Uchiha.