"Like a Dragon/Yakuza" - series ISTPs

 according Personality Database at the time of writing

Toru Hirose - ISTP - 9w8

Masayoshi Tanimura - ISTP - 5w6

Saeko Mukouda - ISTP - 9w8

Yakuza - series ISTPs

Toru Hirose - ISTP - 9w8

Saeko Mukouda - ISTP - 9w8

Masayoshi Tanimura - ISTP - 5w6

Kosei Shishido - ISTP - 8w7

Eric Tomizawa - ISTP 6w5

Mikuru Asakura（朝倉未来）- ISTP - 6w5

Jiro Kawara - ISTP - 8w7

Wen Hai Lee - ISTP - 8w9

Shin Amon - ISTP

Naoto Tagashira - ISTP

Kizuka - ISTP

Tacos Jeffs - ISTP

Spinoffs

Sakamoto Ryoma - ISTP - 8w9

Nagakura Shinpachi - ISTP -8w9

Miyamoto Musashi | Kiryu Kazumanosuke - ISTP - 8w9

Judgment: 

Takayuki Yagami - ISTP - 5w4

Toru Higashi - ISTP - 6w5