Lisa Hamilton (DEAD OR ALIVE)

Lisa Hamilton is a young woman who first appears in Dead or Alive Xtreme Beach Volleyball, being hired by Zack as Zack Island's holiday representative. Prior to her appearance, she was once the lead scientist at DOATEC, being involved in the Epsilon Project. However, for an unknown reason, she released Hayate. She then left DOATEC for a job as a stockbroker, though she still remains affiliated to DOATEC as its lead scientist for Project Alpha.
Lisa is shown to be a very sociable character, getting along with everyone, including Ayane and Christie. She also seems to be a bit of a workaholic, evident by her multiple jobs, and the fact that she is almost always seen doing some form of work. Her multiple careers and job-changing is a trait she shares with Tina, her best friend from her high school days.
In Dead or Alive 4, she appears as a masked luchadora named La Mariposa (ラ・マリポサ, Ra Mariposa?, Spanish for "butterfly"), entering the tournament to match her wrestling skills against Tina's. She also confronts Hayate, revealing to him that she had manipulated him into destroying DOATEC. Also, in a cutscene involving her talking to Helena, she has shown to have some form of resentment with the company, specifically with Donovan's motives. She finally teams up with Tina to defeat a rival wrestling team at the end of her story mode, revealing her true identity in the process.