Emilie de Rochefort better known under her nickname, "Lili", was introduced in Tekken 5: Dark Resurrection and returned for Tekken 6 and Tekken 6: Bloodline Rebellion. She is the only daughter of a wealthy oil magnate in Monaco. She is a sixteen-year-old girl whose fighting style is labeled as "Street Fighting". Lili became interested in fighting when she was kidnapped and held ransom at the age of twelve. She managed to take out one of her captors while struggling violently to free herself.
This triggered her hunger for battle. Because her father is a good-hearted man who hates conflict, and Lili loves him very much, she doesn't want him to be upset. Lili took part in street fighting tournaments around the world under the guise of a vacation from Monaco, using her family's private jet. Lili acquired an invitation to The King of Iron Fist Tournament 5 after defeating an opponent in San Francisco. Realizing that the Mishima Zaibatsu, the main source of her father's problems, is the sponsor of the tournament, Lili decides to enter the tournament so that she can put an end to her father's business troubles.
However in Tekken 6, Lili's father discovers that Lili was a participant in The King of Iron Fist Tournament 5, so he prohibits her from leaving the mansion until further notice as punishment for her disobedience. This prevents Lili from getting revenge on Asuka Kazama that defeated her in the tournament. Her father's oil fields were taken over by the Mishima Zaibatsu, particularly Jin Kazama. Lili enters The King of Iron Fist Tournament 6 to reclaim her father's company and ease her father's anxiety, caused by overworking himself.
~Sauce: Tekkenpedia~