Ko Urashima

Ko Urashima (Urashima Ko, 太郎 子) is the villain protagonist of Tamatebako. He's a Genin-level Missing Ninja from Arainamigakure and the current reincarnation of Daibadatta.

Much like his previous incarnations, he strongly opposes the very idea of the Unification of the Ninja World. In his case, it's because he firmly believes unification will lead to the destruction of the national individualism he's grown to love.

In order to consolidate his opposition, Ko founded Kamikaze which is a political party working to promote national individualism by instigating conflicts that'll widen the division between nations.

Background
Unbeknownst to naught but a select few, Ko is an illegitimate son of a Sunagakure kunoichi named Heisabanri and the Water Daimyō himself. In an attempt to ensure that his infidelity remained relatively unknown, the Water Daimyō tasked Kirigakure with Heisabanri's assassination.

Not long after Ko's birth aboard an Arainamigakure vessel named the Chiyodagata, Kirigakure would boldly stage a hostile boarding. During the resultant confrontation between Arainamigakure and Kirigakure, Heisabanri would use the Transformation Technique (Romaji: Henge no Jutsu, Kanji: 変化の術) to feign an overdue pregnancy. She would then proceed to confront Kirigakure alongside Arainamigakure. After Kirigakure's defeat, Heisabanri would abandon Ko within the personal quarters of Nettaiteikiatsu Koka himself. She would then take her leave from the Chiyodagata while continuing to feign an overdue pregnancy in order to deceive Kirigakure into believing that Ko had not yet been born.

Upon discovering Ko within the confines of his personal quarters, Koka-ue would waste absolutely no time in bringing Ko aboard the Kotetsu and then convincing Taro Urashima and Toyotama-hime Urashima into adopting him. It was at this time that Ko would receive his name from Otohime Urashima of all people.

As a six-year-old, Ko would begin to be tutored by Otohime. As a fourteen-year-old, Koka-ue would pull some strings in order to give Ko the unique experience of having his Genin Exam (Arainamigakure) conducted by a jonin from Sunagakure - Baki - rather than Arainamigakure. During this time, Ko would be awestruck by the extreme differences between Arainamigakure and Sunagakure while Heisabanri would be privileged with the chance to watch the son she abandoned pass the Genin Exam.

As an inexperienced Genin, Ko would spend the entirety of a year subsisting as a freelance mercenary for the sole purpose of traveling the world and admiring the variety of its many civilizations. During this time, he would often find himself coming head-to-head with Kougaiji Tessen. At the end of the year, he would return to the Kotetsu. Not long after, he would discover that Ronin Wangetsujou was attempting to legitimize Arainamigakure by leading Arainamigakure into conforming to the international standards of how a ninja village should operate.

Perceiving such conformity as the destruction of Arainamigakure's national individualism, Ko became infuriated with Ronin. In order to combat Ronin's influence as the Second Ensuikage (Kanji: 二代目塩水影, Romaji: Nidaime Ensuikage, English: Second Brine Shadow), he founded Kamikaze as a political party which fought for the preservation of Arainamigakure's national individualism.

Eventually, Ko would expand Kamikaze into an international organization which works to promote national individualism by instigating conflicts that'll widen the division between nations...