Naruto Uzumaki is introduced as a boy with blonde, spiky hair and blue eyes. He frequently wears an orange jumpsuit. Following his ninja graduation he also wore a headband that denotes his position as a ninja from Konohagakure.[5] In Part II of the manga, which features an older Naruto, he wears a new outfit as a result of his physical growth. The Nine-Tailed Demon Fox sealed in Naruto influences his body, causing him to resemble the Fox over the course of his battles. While initially Naruto only shows small changes such as sharp teeth and claws, he later develops a red tail made of the Fox's vital energy, or chakra.[6] The red chakra starts by surrounding his body; once four tails are manifested, Naruto's blood starts merging with the chakra, coloring his entire body red.[7] As the sixth tail appears, Naruto appears to wear the Fox's skeleton.[8] Once Naruto takes control of the Fox's chakra, he is able to maintain his regular form while using it.[9] As a ninja, Naruto carries many weapons,[10] but relies mostly on his ninja techniques while fighting, specializing in making clones of himself.[11]