Guile (ガイル, Gairu) is a video game character in Capcom's Street Fighter series of fighting games. Although his role in the Street Fighter story was at first minimal, he is considered the third leading and best male character in the series, after Ryu and Ken, largely due to his effectiveness as a character and his popularity. In the live action Street Fighter movie, Guile is given the full name of William F. Guile with the military rank of colonel. Although Capcom did not canonize the name, it was also used in the US Street Fighter cartoon that was loosely based on the movie. However, In the Udon Street Fighter comic book, Guile is the character's first name. According to the official Street Fighter website, Guile has the USAF rank of Major at the time of Street Fighter IV. His Mortal Kombat Rival is Jax Briggs. When Guile was a trainee in the United States Air Force, he befriended his superior officer, Charlie and asked him to teach him in his unique form of fighting, which Charlie agreed to do. Guile learned the style, but his hot temper caused him to be not as proficient in the moves as Charlie was (shown in how Charlie can shoot Sonic Booms with one hand while Guile needs both.) Being responsible for the death of his friend and superior Charlie Nash at the hands of the evil M.Bison, his anger increased so much that he swore revenge to Bison. Lucky for him, a new World Warriors Tournament was opened and a chance of defeating and killing M.Bison but unknown to him, this tournament is a bait for abducting the warriors powers and strenght. He, Chun-Li and other warriors joined to defeat the evil Shadaloo syndicate by taking Bison's henchmens first which are Balrog, Vega and Sagat. Defeating them, Guile was able to defeat Bison aswell. The dictator seen that Guile's power has increased and that he is no more weak. Bison was taunting Guile to kill him, which Guile hesitates and thinks about that killing Bison will become just like him, a murderer. Guile let him alive, until the evil warrior Akuma "killed" Bison with his most powerful move Shun Goku Satsu.
Guile returns home and visits Charlie's grave, admitting that no amount of revenge will bring him back. Suddenly, Julia and Amy show up, telling Guile that they are willing to forgive him if he is willing to come home. Guile is overjoyed and re-dedicates himself to being the best husband and father he can be.