A high-school delinquent and the primary protagonist, who leaves Japan in pursuit of Yumin. His strength and sense of justice earns him the loyalty of his gang and the local community.
His appearence as a boss radiates power. He uses gel to straighten back his hair, giving him an intimidating appearance. In his dinky cram apartment, kitano looks like a punk or a man with no stature. It can be inferred that this is his double life. As a boss he is usually seen wearing a designer suit and leather shoes, the uniform for his gang. He seems to be in his twenties.
In the begining of the story it is made clear that he only lives for one person,Yumin, he tries to be a person who can look her eyes and hide nothing.Kitano Ken is a very impulsive fellow and does the things he deems right which can be seen when he leaves Japan to chase after Yumin.He is also a kind hearted person as he saved a old man who was being beaten up by some gang members and warned them that he will protect the place forever,though he respects those above him he does not fear them and will speak out against them if they are in the wrong.He leads a double life and is essentily two different people, but his persnality does not change much. Ken is very righteous and despises those who pick on the weak. He protects the weak using the strength he gained through constant training. Ken is a down to earth humble guy who does not care much for worldly possesions. He lives by his own believes forces nobody to follow them and will help anybody who asks him. Deep down Ken is a simple man and can be summarised in four simple sentences (which are Benito's Four reasons for following him)
Proof 1: Kitano Ken, The training freak.
Proof 2: Kitano Ken, A man who can admit it when he is wrong.
Proof 3: Kitano Ken, The Boss.
Proof 4: Kitano Ken, Yumin's Slave.
Ken believes the only thing you truly own is the body you shape everyday.
Kitano Ken is originally from Japan, where he had a family who were murdered by Ryu Yoshizawa the father of Yumin.
Later on he meets Yumin and asks her out but is rejected as she is going to Korea to become a Cop, then he drops out of school to follow in her foot steps to also become a cop after seeing her success. However Ken is unsuccessfull as he becomes a jobless shut in, at which point he meets Yumin and tells her a lie about how he works for Korean Gaming Company, to which she is pleased with.
He then spends the last of this money in Pojangmacha, to which the Elderly Owner supplies Ken with a free meal stating "If we make foreigners feel miserable here, we'd feel bad as well". At that same moment the Pojangmacha is ruined by three gangster come to collect protection money from the Owner who has none, as they are about to harvest the Owner's Kidney for money they are attacked by Ken and then the beaten gangsters threaten the Ken by stating the Owner is a deadman as they will come later on to which Ken states:
"NO PROBLEM! COME TRY YOUR BEST! WHETHER IT'S A FEW THOUSAND OR TENS OF THOUSANDS I'LL TAKE YOU ALL ON!!! THERE STILL WOULDN'T BE A PROBLEM! BECAUSE I'LL KEEP PROTECTING THIS PLACE! I'LL PROTECT THIS PLACE FOREVER!"
Tae-Soo then takes Ken to a hotel, then treats him to a meal, where he gives Ken the offer of joining his gang but Ken rejects the offer by saying "Gangs Evil Organisations right?", to which Tae-Soo denies and states that Gangs and Coutries are the same thing. Though this still didn't peak Ken's interest and then they both decided to settle it with their fists. Tae-Soo landed a quick first blow followed by a flurry of punches, while also berating Ken and stating that he understands Ken, to which Ken blocks a direct kick and counters while stating "I JUST WANT TO PROTECT SOMEONE!", however Tae-Soo surrenders and Ken punches the Wall Next to Tae-Soo. Tae-Soo then removes the previous offer and instead states that Ken should be the boss of the organisation, suprising both Marin and Pick Axe.
When he was young he dreamed of becoming a police officer
In his first few panels in the manga he is seen smoking, which contradicts his current lifestyle.
He has only ever lost two fight in the whole manga once as a Boss(to Kim Ban Phuong) and once to KG as a manager.
He later on went to avenge those defeats.
Even though he and the other members of Sun-Ken Rock called him Boss, he never really saw himself being the Boss.
He never killed anybody until chapter 149.