Billy Lee (AKA Bimmy Lee) is one of the two main protagonists of Technōs' Double Dragon series of beat 'em up games. He is the younger twin brother, training partner and in some occasions even rival of Jimmy Lee. He is a master of Sou-Setsu-Ken, a legendary Chinese martial art which he mastered at a young age.
Billy is also the boyfriend of Marian, who is often captured by rival gangs (mainly the Shadow Warriors) in order to lure him and his brother to reveal the secrets of their fighting technique. He and Jimmy exchange blows over Marian and who gets to keep her often.