Made of chakra

The sharingan.

Hidan looked at them with a crazy look in his eyes with a dark smirk on his face.

"Now girl, you and I are gonna share the same pain." Then he took some kind of bottle with a red liquid inside that looks like blood (and smells like it if you ask Naruto). He spilled the liquid on the floor and drew a circle with a triangle inside on the floor with the blood, then licked fu's blood off from his scythes blade. After licking the blood he looked like he had a full body skeleton tattoo.

Naruto looked at him, ready to pounce if Hidan tried to advance towards them. He tensed even more when Hidan pulled out a stick that stretched in to a pointed weapon.

"Now lets share some pain!!!" Hidan shouted with a crazier look in his eyes and stabbed his leg. Then pulled it out and stabbed his other leg. Fu screamed and fell on he knees with blood spilling from the same spot Hidan stabbed himself.

He raised his hand to the air and said in a blissful tone with a lot of crazy in it. "Do you feel it. Do you feel Jashin-sama's gift! Do you feel the power of our unity!! DO YOU...." Hidan said getting louder each time with his eyes closed, but was interrupted by an earthquake below him then a red chakra arm emerged out of the ground below him, destroying the circle and ending the ritual. He jumped out of the way just in time to avoid the punch.

"You. Nine tails. Wait for your turn." Hidan said. But then he got punched in the gut so hard he flew to about a kilometer away, hitting trees creating a dust cloud.

"That idiots Immortality is gonna be the death of him." Another akatsuki member showed up from behind and lunched a devastating fire jutsu from what looks like a black inked doll with a mask. The fire jutsu hit Naruto dead center on his fox chest.

"Naruto!" Fu yelled. He legs haven't fully healed and it's gonna take time to be able to stand. 'What was that silver haired idiots jutsu?!' Thought fu feeling a little frustrated and a lot of pain in her legs.

"Your biju friend will be out of the count for now. In the mean tjme I could tie him up then get to you afterwards. It's all over for you now." Kakuzu said with that low dark voice

"It ain't over. Not by a long shot." Naruto said, pulling himself back into the clearing. His chest open but seems to be healing at a faster rate then fu's. In just 5 seconds ,since he announced himself ,his wound was healed. Then he turned into his human form. To everyone it looked like the fur on his body was shedding of, falling to the ground.

'Shadow clone jutsu'. In a puff of smoke a clone appeared. This clone didn't have a tail behind him, but he kept the animalistic features of Naruto. "What's the point of creating a clone if it's missing some of your features."

"Oh this clone is not for fooling you." Then the clone attacked Kakuzu who was forced to jump away from fu. While in midair he launched his hand to grab fu but the clone kicked it back toward him ,grabbed Fu ,then jump back to the original. Kakuzu dodged his own arm and landed on a tree, retracting his arm in the process.

"That's one powerful clone you got there." Kakuzu said a little wary this time as he gazed at Naruto.

"You little shit!" Hidan showed up in the air with his scythe poised to cut Naruto in half. Naruto just looked once at him and faced Kakuzu while one of his tails slapped Hidan out of the air. He crashed into the base of a tree then it fell on him.

'That's some power in those tailed. He didn't even spare Hidan that much of glance. Like he already predicted how he was gonna hit him."   Kakuzu Thought. Then he saw the moon light shine into Naruto eyes (the same way a dogs eyes shine at night but with the sharingan appearing. His eyes widened. "The sharingan?!" When he saw it he averted his eye to avoid eye contact.