Marshall Law is an American fighter of Chinese descent, as well as a hero, who was introduced in the original Tekken game, and has returned for all subsequent Tekken games, except Tekken 3 and Tekken Tag Tournament (where he was replaced by his son, Forest Law). He is a very close friend of Paul Phoenix and is married to Mrs. Law, from which he had a son, Forest.
Marshall Law is based off of martial arts legend, Bruce Lee, and even uses Bruce's iconic Jeet Kune Do fighting style. In the original Tekken, Law worked in a Chinatown restaurant in San Francisco, with dreams to open up his own martial arts school. He is a master of martial arts and took part in the first King of Iron Fist Tournament in order to win prize money, so that he could open his martial arts school, and also to become famous.
In Tekken 2, Law's dreams came true and he opened up his own martial arts dojo. Unfortunately, his students were attacked and severely injured by a villain who was participating in the tournament. Law decided to enter the tournament to avenge his students and to restore the reputation of his dojo. Once Marshall Law's son (Forest Law) was of age, he began managing the dojo with him.
By the time of Tekken 4, Marshall Law was a successful businessman. He managed a newly established dojo and even owned a nationwide Chinese fast food chain called Marshall China. Unfortunately, he lost a franchise war against a competitor and had to declare bankruptcy a year later. Unable to deal with his failure, Marshall fell into depression and spent his days at home in a drunken haze. Then one day, a notice for the Tournament arrived at his doorstep. Marshall's eyes flashed with renewed vigor. After a month of intense training, he beat himself back into top physical form.
During the middle of the King of Iron Fist Tournament 5, it was discovered that Marshall Law was working illegally in Japan, and as a result he was immediately deported to his home country of the United States of America. With the deadline to pay for the damages of his son's accident fast approaching, hopes of getting the money needed slim. Just then, his best friend Paul Phoenix approached him with the idea of forming a team. Securing a high-ranking prize alone would certainly be difficult, but if he was part of a team, the probability of winning would be much higher. Marshall accepted Paul's invite, but thinking a three-man team was better two, the renowned boxer Steve Fox caught his attention.
- Marshall seems to have financial troubles in almost every game, which serves as his motivation for joining the tournaments (winning the prize money).