Creation and design
Tekken series director Katsuhiro Harada has stated that Jin is his favorite character in the overall series alongside Heihachi Mishima as he states that the story from Tekken is written from Jin's perspective because of being the main character. Jin's concept was that of an innocent young kid corrupted by the evils of society that would become one of the series' greatest villains as crafted by Harada for approximately ten years. He was introduced using the concept of "misfortunate character" following his dark character arc across the series. Nevertheless, the staff also wanted to make him into a determined character. By transforming into a villain in Tekken 6, Harada motivated players to use the Scenario Campaign to explore Jin's darker character arc as well as his possible with newcomer Lars Alexandersson. In response to claims that the story of Tekken was complicated, Harada denied as he saw it as a "simple" struggle between members from the Mishima family. While by 2017, fans still saw Jin as a hero, Harada replied that the character is still responsible for creating wars and thus, there was black and white morality.
For Tekken 7, Jin was made into a hidden sub-boss in the game's arcade mode with requirements being to unlock being too difficult as explained by Harada. Tekken 5 also features a special costume designed by guest artist Mutsumi Inomata for Jin: it is a panda-themed costume with an unzipped jacket that only reaches just above his midriff with a blue flame motif and a matching white pants. In Tekken 6, replacing the jumpsuit, Jin instead wears a long black coat similar to the one that he wore in his ending in Tekken 5. Jin's alternative outfit in Tekken 6 was designed by Clamp, a group of four Japanese manga artists. Before the revelation of Jin's inclusion in Tekken 7, there were many gamers who asked Harada if Jin survived to his battle against Azazel in Tekken 6. Harada refrained from answering Jin's status but stated Tekken 7 will be a proper sequel to the series with or without Jin. In 2016, Harada commented he had his own family. As a result he compared it with the violent characters from Tekken who are contanstly fighting each other: Heihachi, Jin and Kazuya. He viewed this type of family too hard in comparison. In regards to ending the rivalry between Jin and Kazuya, Harada stated Jun Kazama would be present in the story.
For the film Tekken: Blood Vengeance, writer Dai Satō added both Jin and Kazuya to be a pair of men to provide "visual eye-candy" in the same way with the William sisters. While Jin and Xiaoyu appeared to have developed a close relationship, Satō did not want to explore a romantical one in the movie. Instead, the writer wanted to use these pairs to be played together in the spin-off game Tekken Tag Tournament 2 which relies on the use of teams composed of two fighters.
Jon Foo felt honored to play Jin's character in the live-action film based on the series. He remarks being a fan of the Tekken games. Still, he found difficulties in playing Jin as he spent three months with a diet to do fighting moves for the live-action movie. In the making of the film, Foo accidentally wounded Cung Le during the filming of the movie. The film's director, Dwight Little, found this accident common in fighting movies.
As a result of being introduced as the protagonist in Tekken 3, Jin's movements were made to be balanced so that he would not have neither strong or weak movesets, which caused difficulties in the design of the character. As Jin has no model for his fighting style, several of his karate moves were created by the Tekken staff. Ryu Narushima was Jin's motion actor as Narushima also possessed regular karate in his fighting style.
In his early appearances, Jin's moves were a blend between both of his parents, Jun Kazama and Kazuya Mishima—a combination of "Kazama-Style Self Defense" and "Mishima Fighting Karate". He fights in this style in both Tekken 3 and Tekken Tag Tournament. In Tekken 4, however, this style was discarded in favor of "traditional" Karate. Jin Kazama is often regarded as the best character choice in Tekken 4. As Jin's power was therefore reduced, in following games he would go through minor changes. Devil Jin incorporates moves from Jin's previous incarnations, which makes him a stronger fighter than Jin. In preparations for Tekken 7, Harada comments he would often try Devil Jin if he was an "intermediate player" comparing his skills with Heihachi's. For Capcom's crossover game Street Fighter X Tekken, the official guide noted how Jin could easily counterattack enemy's moves.