The Reiss Orphanage
Kazuki Kenta is the Shinobi Wildcard, hailing from the country of Asura. Being a Wildcard, meaning that he is both a Joker and an Ace, Kazuki is able to apply AIM Diffusion to his OGenes, therefore granting him practically limitless potential. Ken is additionally a survivor of the Reiss Orphanage Massacre. Kenta has many followers in Asura, and is the leader of a large group called Kazuki-Gun.
Kenta is charismatic and hedonistic, two traits that heavily contribute to the large number of people that have flocked to him. Kenta will do anything that he thinks is fun, and generally tries his best to make sure that those around him share in it. He makes friends incredibly easily, and becomes attached to them just as quickly, knowing every single member of Kazuki-Gun by name despite his followers easily numbering in the thousands.
Shipped from his home country at a young age to act as a slave, Kenta was eventually able to escape his captors utilizing his Joker powers. Soon after he was found by the Reiss Orphanage, and was kept in their care for several years. This didn't last forever, as the Reiss Orphanage was eventually destroyed, and Kazuki was captured soon after and made into a Wildcard. After the collapse of the Wildcard program, Kenta was able to escape back to his home country of Asura. There he met a large group of people that followed the guidance of "Ninshu", and before long they as well as many others became to be known as Kazuki-Gun, under Kenta's leadership.