Jugo

Jūgo is a unique character in "Naruto." He belongs to an unnamed clan with a rare "Sage Transformation" ability, allowing him to absorb natural energy to alter his body and gain immense power. However, this ability also makes it difficult for him to control his emotions, often causing him to become berserk and threaten those around him. To suppress this loss of control, he voluntarily sought help at Orochimaru's Northern Hideout, where he was imprisoned. He later joined Sasuke Uchiha's "Hebi" (later "Taka") squad. Despite appearing cold and bloodthirsty on the surface, Jūgo is gentle at heart, loves animals, and is loyal to his friends. He believes that Sasuke is the only one capable of controlling his berserk state, so he trusts and relies on Sasuke greatly. His body alteration ability allows him to freely change his body's form in battle, making him a formidable character on the battlefield. Jūgo's Sage Transformation ability also inspired Orochimaru's development of the Cursed Seals.