One common theme could be adventure. Since it's set in an 'underground' setting, there might be elements of exploring the unknown, facing challenges and obstacles. Another theme might be the relationship between rex and the devilartemis characters, which could involve friendship, rivalry or even some form of cooperation.
The Yakuza games story portrays Yakuza culture in several ways. It shows their hierarchical structure. The higher - ups have great power and respect, and the lower - level members have to follow strict rules. Also, their sense of justice within their own world is depicted. They have their own way of dealing with disputes and traitors which is part of their unique culture.
Well, I'm not that familiar with specific 'rex in the underground devilartemis fanfiction' stories. But you could try searching on popular fanfiction websites like Archive of Our Own. They usually have a wide variety of fanfictions and you might be able to find some good ones related to this there.
One of the best yakuza stories is about loyalty within the yakuza clans. For example, there are tales of yakuza members who would sacrifice themselves to protect their bosses. They consider honor and loyalty above all else, and these stories often show how they adhere to a strict code of conduct even in the face of danger.
One of the well - known best yakuza novels is 'Tokyo Underworld' by Robert Whiting. It delves deep into the seedy underworld of the yakuza in Tokyo, showing their power struggles, criminal activities, and the complex web of relationships within the organization. Another great one could be 'Out' by Natsuo Kirino. Although not strictly a traditional yakuza - centric novel, it involves elements of the criminal underworld where the yakuza operate, and it's a very gripping story of women involved in a crime related to the yakuza world. Then there's 'Six Four' by Hideo Yokoyama which also touches on the yakuza influence in Japanese society among other complex themes.
Yakuza 0 isn't based on reality. It offers a unique and immersive fictional story filled with action, drama, and adventure. The game stands on its own as a work of fiction.
The story of Yakuza 3 is quite substantial. It typically takes players several hours to complete, depending on their playstyle and how much they explore the side content.