the first chapter will be when he is 13 and will be the day the Uchiha massacre occured and will go into more detail about Kouen and his past.

name:Uchiha Kouen

age:16

village:Konohagakure

rank:Anbu

mask/codename:mask is a wolf and codename is KageOkami(shadow wolf)

Family

Father:Uchiha Fugaku

Mother:unknown

Brothers:Uchiha Itachi(half brother), Uchiha Sasuke(half brother)

Looks (pics on my profile page)

Hair:black with choppy layers shoulder length in the back and middle length bangs in the front

face:looks exactly like Uchiha Madara

body:athletic and well toned but not too muscled

Background

was left on Fugaku and Mikoto Uchiha's door step when he was 2 months old with a note attached explaining that he was Fugaku's son and about his blood through his mother and why it was too dangerous for her to keep him and that she hopes they will love him and take care of him like they do Itachi.

after finding him they ran blood tests and they all came back positive to being Fugaku's son.
after that they had no other option but to try to keep him a secret, it would be bad if word got out about the Uchiha clan leader being unfaithful so they kept him locked up in the compound until he was old enough to start training to be a ninja.
during that time he never had any contact with any other person besides Fugaku, they would not let him see his brothers and Mikoto refused to even so much as look at him saying he was an "impurity to the Uchiha clan".
he quickly showed signs of being a prodigy with skills that were on par with Itachi, he was placed in the ninja academy at age 6 and graduated at the age of 8 as well as activating his sharingan at that age.
when he graduated the academy the Uchiha clan decided he was too much of an liability to the clan so they cast him out to survive on his own, it was then that he met Hatake Kakashi and was taken in by him.
he then became a Chunnin when he was 9, mastered the sharingan at age 10 and become a Jonin when he was 11 he then became an anbu at 12 and was assingned as a member of Itachi's squad, the newly acquainted brothers became an unstoppable team up for until the Uchiha Massacre hat happened when he was 13.
after the incident he decided to leave the village for a while so he stopped being a ninja and instead became a singer for a popular visual kei band, he traveled the world for almost 2 years but finally decided to return to Konoha and join the Anbu again.
after that he confronted Sasuke about being his brother and moved in with him in his apartment in Konoha.