Omi is the baby of the assassin family, and yet he is the most experienced of them all. He became an assassin at a very young age, after he was kidnapped and his father refused to pay the ransom. He was rescued by a man he would come to know as "Persia," who Omi would eventually discover to be his uncle.

Omi is the tech of the group, most often responsible for hacking into computers and security systems. Though he is probably way too smart for it, Omi attends regular high school when he's not busy being an assassin and working in the flower shop.

Kenken is a former J-League Football (soccer to those of us in the US) Goalie. He was framed for betting on his own games and throwing them to make his bets. At one point, one of Ken's old friends shows up as a target and that kind of sends him down a path that causes problems down the line, about the time of the OAVs. He kinda starts to go crazy.

Ken has a very bad potty mouth and loses his temper easily, which probably helps him go nuts later. He coaches a local soccer team when he's not otherwise working.

Aya (formerly Ran) is arguably the most screwed up of the four young men, and one of my favorite characters. His family was killed and he went on a vengeance kick that would make Inigo Montoya proud. He adoped his sister's name as a reminder of what he was fighting for.

Aya takes just about all missions that come his way, because he's got the hospital expenses for his comatose sister to pay for. He's very quiet and withdrawn, and can often be heard shouting at the girls in the flower shop to "Buy something or leave!"

Aya kind of acts as the group leader and has the tendency to abandon mission procedure if he sees the opportunity to extract his revenge.

Youji is a playboy, boasting that he'll date anything over the age of 18. He is a flirt, and he wears his sunglasses pretty much all the time, even indoors.