Laura Mackintosh is Alisa Mackintosh's sister in the anime.
Laura is an anime-only character. She is the twin sister to Alisa Mackintosh, where she appears for the first time after Robin Mask's change of character in the 21st Chojin Olympics: The Big Fight, and pleads with him to change his ways and become a Justice Chojin once again. It is revealed she had a close relationship with Robin, through a series of flashbacks, and that she wants Robin to return to the man that she once knew during his courtship with Alisa.
(More to Come)