Kusari Enishi Ren, brother of Kusari Shion - Though she probably doesn't know that. He was born six years before her, lived with their parents in Yukigakure in relative peace and was allowed to find his own way in life. At that time, he was happy, elated, joyfull and the news of his brand new sister only made him even happier. His parent's shared in his joy, but after the birth and their mother's death, it wasn't so joyous. He only got to see his sister once and that time was fleeting, but it impressed upon his mind the person he would devote his life to finding. His father threw him out at that point, blaming him for the death of his mother. There was no sanity left in his father concerning Ren, but at least, he though, Shion would experience a good life. So he left Yukigakure, to find his own way and eventually met up with a nomadic tribe that travelled around. They could mostly be called gypsies or Romanies. This tribe would be his refuge until he was eightteen.
This tribe taught him skills, he did mostly benign work around their camps and for that he was given food and a place to sleep. However, there was a man there. A rather old man who had devoted his life to studying the combat styles of others. He had a small show in the scheme of their performances that showcased his still austere martial arts abilities. Many people enjoyed the show, especially ninja, as he was able to showcase world martial arts to people that had never seen them. It would be this man who gave him his new name.
By the age of eightteen, Ren had been assisting this man, called Enishi, in his performances and in exchange, Ren was slowly being taught the Enishi style and art of fighting. This was a style characterized by it's analysis of an enemies movements and then the creation of a turn-of-the-moment counter to their style. In the hands of someone who could think quickly, analyze and then apply, the style was fearsome. It is important to note that Enishi had no name for his style, but instead, Ren named it after the man.
At around the time he was twenty, their tribe would be attacked in the lands of Sunagakure. There, he would survive only because he had been sent off earlier to find water. When he returned, everything was gone. The people were dead, the carts destroyed and the supplies ruined. All except for one person, the old man, Enishi. Through kindness, Ren was given the clothes Enishi use to wear in his youth on his travels and then Ren was given something else. Apparently, Ren had been found by the tribe when he was near death. On his body, the tribe had found only two things. A note that explained who he was, facts which he had forgotten as he settled into this life. Then there was something else, a picture of his mother and father holding his newborn sister, Kusari Shion. Enishi explained that the meaning behind his name was something mystical. The word itself, Enishi, was a way of expressing the ties that bind all people together. Some ties are stronger than others, some have different appearances, some are evil, some are pure. However, these ties all explain the way in which people are related. He told him that these momentos were something Ren had left to himself in order to remind him of his own Enishi, his own desire.
In response to this, Ren took what he could and offered the man a shoulder during his last hours. At the end of it all, he buried the tribe, or what was left, and then he made himself a new name. He was no longer Kusari Ren, he was now Enishi Ren, disciple of the 'old man.'
After the burial of the tribe, he began to search actively for his sister. He didn't know why he needed to find her, but something told him that he desparately wanted to see her. Until now, he had only been travelling to live. Now he was travelling to fufill a goal. His search would eventually lead him back to Kirigakure, to the place where she currently lived, their father having loosened his leash on her enough to let her attend school. However, the odds were that even if he saw her, she wouldn't know him. Sure enough, he spent much time watching her quietly and then he realized, he had no right to interefere with her life so for awhile he stayed away. In Kiri, but not in Kiri. He was twenty one now and that's when it happened. He had a habit of sneaking around the rooftops of night, mostly to see his sister. Even though he didn't want to interrupt her life, he also loved her and seeing her well made him happy. However, that night, he would have chosen to be late instead. When he came to the apartment, it was gone, along with any trace of Shion. He considered this his fault. That maybe if he hadn't been afraid and just came back, this wouldn't have happened. It broke him.
From then on, for the next three years to now, he's been travelling the world in search of his sister. He has an undying need to see her and apologize to her for what he allowed to happen to her. The only problem is, he's been unable to find her and with no current picture, it might be hard.