I'm sorry this so long. I tried to keep it short.
Kageryu is one of seven siblings born to represent the elements of Fire, Water, Earth, Wind, Lightning, Light and Darkness. His father was known as the Dragon Shinobi and due to this Kageryu and his siblings are named for their elements and their heritage. His brother for example is named Horyu for his attribute of Fire, ho for fire and ryu for dragon. His family had the duty of keeping the balance between all the elements, but when his twin brother, Akariryu, was killed “accidently” by his father to keep the balance within the family’s control forever, he abandoned his duty and left his family to wander the world. Due to this, no one has been born with either elemental attribute for thousands of years. Along his travels he found out the truth of his brother’s murder and the reasons behind it, causing him to decide to avenge Akariryu’s death by destroying his father and releasing the balance to those who he thinks should be the true guardians of that balance, the Kages of the Five Great Nations. As the Guardian of the Darkness Chakra, his chakra can not be seen by anything, not even the Byakugan eyes. Horyu’s chakra would be seen as streams of molten flame. Among the gifts gained by Guardianship is his ability to live indefinitely if he isn’t killed by mortal means, and to control raw darkness in its purest forms (that includes shadows from his surroundings) to create weapons or even recreations of people. These people do not have wills or personalities of their own, though and must mimic or be directed by Kageryu. His favorite jutsu is to take his opponents to the Shadow Universe and let the shadow-demons devour them whole, though he rarely uses it unless he really hates someone. His greatest jutsu is the ability to encase his opponent in shadows, imprisoning them in utter darkness without anything to stimulate their senses ever again. They do not die of starvation or dehydration so they are cursed to the insanity of never-ending darkness. He dresses in a tight but stretchy black shirt with loose, wrist-length sleeves, black pants with matching bands wrapped around his shins and he carries an ivory amulet of a dragon’s head carved for him by Akariryu when they were very young. He currently searches the Five Great Nations for the one power that his father ever feared, known in ancient texts as the Great Wolf of the Moon, which in reality is a tenth Tailed Beast, more powerful than even the Nine-Tails. With this power he hopes to avenge Akariryu’s death, but his way is impeded by the forces of his other siblings who still serve the balance and his father. They do not understand why he would betray them this way, but they still will not hesitate to prevent him from ruining their lives further. They do not see that he is really trying to free them all from their father’s evil influence. He doesn’t want to kill them but will if it means avenging his brother.
Message me if you like this character and would like to know more of him and his family.
The others aren't as long since most of their history is pretty much the same.
P.S. He sounds evil, but he's more of an anti-hero.