Possible Factions:

[b][u]National Police Agency - 警察庁 [/b][/u]
The Japanese [url= http://filesmelt.com/dl/Fukushima_Roadblock.jpeg]Police[/url] work in cooperation with the Defense Forces to maintain the Owari. They're not particularly well-armed under normal circumstances and will not usually venture very far into the Zone. The only exception of this is the Criminal Investigation Bureau which recently has been taken in active part in trying to curb the recent influx of trespassers in The Zone by conducting undercover operations to infiltrate the larger Sutoka groups which have begun to become an ever increasing presence inside the Zone. It's not uncommon for new Sutoka's to meet their contact hoping for safe and discreet passage past the Owari only to find themselves being arrested by an undercover detective. 

[b][u]Japanese Self Defense Force - 自衛隊 [/b][/u]
[url= http://filesmelt.com/dl/IMG_0037_1.JPG]The Defense Forces[/url] are the military forces of Japan. In the Fukushima Zone they're primarily responsible for maintaining the Owari. In certain instances they may be seen entering the Exclusion Zone to provide armed security and transport for various other organizations such as The United Nations Nuclear Energy Commission or to support the small presence of Japanese Scientists inside the Zone. The prior attempts following the 2014 meltdown to reestablish control over the Nuclear Daiichi Nuclear Power Station all ended in disastrous failure and at the cost of human lives and has since been abandoned. On rare occasions they have been known to enter The Zone to participate in anit-Sutoka raids and operations. 

[b][u]Stuoka - ストーカー[/b][/u] 
After the 2011 meltdown there has always been a group drawn to the Exclusion Zone. The curious, the journalists, scientists, tourists and thrill seekers, prior to the 2014 they had been mostly tolerated and found access to the Exclusion Zone easy as travel restrictions were nearly non-existent at the time. The second meltdown changed the demographic. More than ever people are drawn by The Zone. Some feel unexplained, spiritual connections that compel them to enter The Zone. Others are explorers, adventurers who want to explore the Fukushima Zone as it's landscape begins to change. Some outlaws find sanctuary inside The Zone such as the infamous Yakuza. The most common type of Stuoka are the treasure hunters. The rumored priceless artifacts being discovered in the Zone draw them in, venturing deep into the Zone to find increasingly more valuable and rare artifacts. The most valuable artifacts are said to be in the Fukushima Daiichi Plant it's self, though no Stuoka has ever successfully made the journey to return.

[b][u]Yakuza - ヤクザ[/b][/u]
Almost all criminals fall into the Yakuza chain of command one way or another. Be it a lone bandit that has to pay his respect to the local Yakuza boss are a well oiled organization with rank and status the Yakuza control a lot of the goings on inside the Zone. They're the ones that are able to bribe and pay off guards, locate back doors into the Zone, negotiate the sale of artifacts on the black market, smuggle equipment in and out of checkpoints and so on. It's practically a requirement for a typical Stuoka to deal with the Yakuza in some capacity or another and that relationship is even more important when you're in the Zone for the intention of ill gains. Rival clans and gangs will engage in open hostilities with one another and have no reservation with using violent means to control their territory, artifacts and money within in it. 

[b][u]Japanese Scientific Advancement Society - 日本学術振興会[/b][/u]
The Japanese Scientific Advancement Society is a private think-tank that was involved in the aftermath of the first meltdown. They took readings and measurements, soil and water samples, advised the Government and local authorities and possible plans of actions to reduce the effects of the radioactive release. After the second meltdown the organization saw a sudden influx of funding from corporations and government agencies to conduct research into the Zone. They have support of the Defense Force and are often seen conducting security for their field research stations.

[b][u]Cultists - 崇拝[/b][/u]
Japan has had some experience with dangerous cults in their history. It seems natural that a disaster on the scale of the Earthquake, Tsunami and resulting Nuclear meltdowns would attract the attention of those with questionable ideology. Outside and within the Zone exist cults of varying degree of commitments to their beliefs. Some of the more radical have erected themselves temples inside of the Exclusion Zone away from authorities where they can perform any manner of worship by any means they desire. There are neutral cults that prefer self-destruction of themselves through self inflicted exposure to radiation and dangerous one that wouldn't think twice about kidnapping a lone Stuoka for their own purposes.. whatever they may be.

[b][u]Hibakusha - 被爆者[/b][/u]
Originally a term used in the aftermath of the atomic bombings during World War II the term Hibakusha has found new use as a term to describe those whom still live inside the Exclusion Zone. Though they are not numerous there are a handful of people who remained behind for various reasons. Some refused to give up their homes, some look after abandoned pets and so on. They're typically the elderly, the forgotten. Sometimes they're direct victims of the nuclear disaster, mutations and deformities forcing them out of mainstream society, right back to where their torment began to live a life of isolation, usually alone and sometimes in small shunned villages. The Hibakusha are largely docile and prefer to be left alone.