Ronin

Early Life
Aaron James Cox was born July 19, 2002 in Brooklyn, New York to Michael Cox and Angela Wilson. When Aaron was 2 years old, his parents were killed in a car accident, and Aaron was raised by his Grandmother, Janet Cox, who raised him like he was her own son.

Aaron began to excel in school, and was constantly testing at a much higher grade level than he was. But, Aaron was also pretty scrawny and shy, so he was picked on by his bigger classmates.

Meeting the Black Moon
One day, when Aaron was 10, he was walking home from school, he was confronted by two of his bullies, John Ramsey and Donald Jones. Aaron had made them upset earlier, and they wanted to let him know, but Aaron started running. They chased him into an alleyway, and cornered Aaron. But, as they were about to attack him, an older Japanese man grabbed one of them and threw them, and scared off the other. Aaron thanked the man, who said his name was Akio Tanaka. Aaron asked what he did, and Akio said he was trained in many forms of Martial Arts. After a lot of pestering, Akio decided he would train Aaron.

For the next 6 years, Aaron would go to Akio's house almost everyday, where he was trained in Martial Arts, Ninjitsu, Espionage, and Swordsmanship, which he quickly excelled at, and soon became close to Akio's level. Akio revealed to Aaron that he used to be the Black Moon, the leader of a secret ninja clan in Japan, called the Moon Clan, but he was exiled, and moved to Brooklyn.

Akio soon became like a father figure to Aaron, who helped him with more than just training, like schoolwork and even social problems. Akio said that if he wanted to be a master fighter, he would also have to be a master with his brain.

The wrong path
When Aaron was 16, he started hanging out with some sketchy people. Akio caught onto this, and confronted Aaron about it. Aaron, who was being corrupted by these people, lashed out at him, and they got into a fight. Akio, who saw what he saw in an old member of the Moon Clan (one that killed half of the clan in an attempt to take control), left, not wanting Aaron to turn out the same, left before his training was finished (although he later found that leaving was not the best idea).

Aaron blamed Akio, and resented him. He kept hanging out with the wrong people, and eventually got pushed into joining a street gang. Using his training, he was able to rise up in the ranks, eventually meeting Percy Strong and Eddie Andrews, both teenagers like him who were caught up in bad crowds.

Reunion
As Aaron rose up in the ranks, he began seeing the inhuman and utterly terrible things the gang was doing, and he quit. He also secretly (or so he thought) told the cops about their activities. Some people in the gang caught on, and they put a hit on him.

The assassin came to Aaron's apartment, but he wasn't home, so he instead killed the secondary target, Aaron's grandmother, Janet. When Aaron returned home, he found his mother mortally wounded, barely clinging onto life, and she died in his arms. Because of this, Aaron went a rampage, wiping out a large portion of the higher-ups in his former gang before being arrested.

While in a holding cell, Aaron was bailed out by none other than his former master, Akio Tanaka. Akio and Aaron started off rough, with Aaron still resenting him, although he eventually came around when Akio apologized and told him why he left. He also said that he would finish Aaron's training.

Finishing Training and becoming Ronin
Akio and Aaron would continue his training, which was already almost finished. Once he "graduated", Aaron was gifted a Moon Clan headband, a traditional headband worn by members of the clan who finish their training. During his training, Aaron still felt guilt about the death of his grandmother, so he decided to use his exceptional skills and training to take down criminals like the ones that killed his grandmother. His main target, though, was the assassin that killed his grandmother.

Akio eventually caught on to Aaron vigilantism, which he initially was skeptical about, but became okay with. One day, when Aaron finally tracked down his grandmother's killer, Franklin Norris. He confronted him, but he underestimated both Norris' abilities and how much backup he had (his former gang), and he allowed his anger to cloud him. Among the gang members were Percy and Eddie. Aaron was nearly beaten to death, but Akio showed up and saved his life, but was killed in the process.