Lisa

When Lisa first appeared in Dead or Alive Xtreme Beach Volleyball, she was under employment by veteran Zack, who apparently used his prize money to buy an island for a volleyball contest.In DOA 4, Lisa is revealed to be the woman behind the mask of the mysterious luchadora La Mariposa. Apparently, she is also responsible for Hayate's memory difficulties, though she is ultimately more interested in wrestling Tina than in the affairs of DOATEC. Some references are made that Helena and Lisa have worked together before. Lisa also seems to know the details of Project ALPHA-152 and admits to having tricked the Ninja of the Mugen Tenshin Clan into attacking the DOATEC Tritower.

Credits:
Papacha, and Megaman_Zero from Wikipedia.