Kakumei was born to Mei and Aki of the Sumi Clan of Kirigakure, their third of four children. Just like all children of the Sumi clan, he was raised even at a young age with intent to join the academy. Kakumei's family enforced strict training for all their children, and they were submitted to rigorous and exhausted tests offset by luxuries of a rich and noble Clan. In actuality, the riches and comforts that Kakumei and his siblings grew up around were all purchased through debt. Mei and Aki were constantly borrowing, stretching the limits of their reputation an collateral to keep up the facade of their wealth and clout.
Kakumei joined the Academy of Kirigakure just like the rest of her siblings. While most of the Sumi children were ostracized under a perceived reputation that they would be stuck up or would look down on their peers. The Sumi children mostly stuck together, helping each other along. When it came time for the Genin Exams, Kakumei was advanced enough to take the test along side his two older siblings, while the youngest waited for the next test. It was decided that the oldest three would undergo the 'Ten Irezumi' to prepare them for their test. Mei and Aki pressured their children into the process, and their entire lives had been full of the propaganda that lead them up to the procedure. Right before the 'Ten Irezumi', Mei and Aki admitted that their family was broken, and that the children would be the only hope.
The process of forcing the ink into them was torturous, painful and nauseating. The ink was like venom and fire as it coursed through them. Each injection felt like it took hours, even if it was only a few minutes. The children had reached the highest dose recorded, but the weight of their clan's future and their parents pressure from before was enough to make them push further. Kakumei was pushed to the brink of death, but he was the lucky one -- Kakumei's two siblings having pushed too far, and were killed in the process. Kakumei took almost two weeks to recover, and the Clan celebrated his achievements, even if Kakumei was now all too aware of how little they had improved him.
For Kakumei -- the Shinobi Drugs on his character sheet are from this process. Each of these drugs would be dangerous for a fully trained ninja, never mind a child; and forcing so many onto one person would be seem as ludicrous. The Clan hired a Jonin Medic-Nin to assist with the procedure, and utilizing 'Poison Purge' and 'Poison Ward', prevented any permanent damage in Kakumei. The cost of hiring a Jonin for a Rank-A Mission (Wealth: 30) has already been subtracted from Kakumei's sheet for this -- the family might have paid for it, but since it benefits Kakumei, the cost was taken out of his sheet.
Kakumei passed the Genin test. His own potential outweighing his internal struggle and sadness. It was that fire, expertise, and efficiency that drew him the eye of Tsukiri Suke, the Mizukage's personal assistant and bodyguard. Kakumei was eager to distance himself from his family, quickly joining up with two other Genin in a squad under a Jonin. The fresh squad worked mostly on D-Rank missions, but when one mission ended up being a high C-Rank, Kakumei had a chance to shine. An escort mission that didn't expect any opposition was besieged by a cartel. Kakumei lead the squad through the situation without issue, disabling the cartel bandits so they could be collected by the authorities. From there, the squad worked only C-Rank missions.
Kakumei avoided his parents, still resenting them for the death of his two siblings. He met with his younger brother, but always outside of the house. He tried to push the little brother to quit the academy in general, and when that failed, to at least delay his exam. His little brother was too wrapped up in following in Kakumei's footsteps to understand that his situation was unique, or lucky. Tsukiri Suke occasionally met Kakumei for tea, the importance of which was lost on the young Genin.
Kakumei's squad took the Chuunin test together and graduated on the top of the exam. During the written exams, Kakumei used illusions that only her squad could see to help cheat during the written tests. During the second stage, Kakumei made the goal of the tower invisible to all of the other students, bargaining information for the right to even let them finish. During the final tournament, Kakumei bested his own opponents without drawing a weapon. During stage two, Kakumei had used the bargaining with the other Shinobi simply to gain exposure to them, to plant suggestions and fears in their heads, which only revealed themselves during the tournament -- giving Kakumei's squad mates an advantage even when Kakumei wasn't there.
The squad went their separate ways after the exam. Kakumei had used his years as a Genin to distract him from the death of his siblings and the corruption of his family. Now that he was on his own, he had no choice but to address it. He decided to use his gifts to find a replacement to the Ten Irezumi -- to find a new power source for his clan; hopefully before his little brother tried the Ten Irezumi and hopefully before he'd have to take more drastic measures against the Clan to stop their barbaric practices...
<MENTOR LADY> officiated a relationship with Kakumei as his mentor. Kakumei was groomed for espionage, counter intelligence, diplomacy, and Genjutsu. He found time between his own mission to accompany her in mediation amongst Kirigakure's Clans, as well as summits with the other villages. It helped broaden Kakumei's horizon, he was forced to study and learn from other cultures, learn the rumors of other Clan's techniques. When he's not working directly with his Mentor, Kakumei is an established Chuunin. He is most commonly hired for espionage, for cease fires, and for capture missions. Even as a Chuunin, he's completed multiple B-Ranked missions, and been party to two A-Rank missions.