Helena is a character and a minor antagonist of Mario The Music Box: ARC. She is known as the witch of illusion and was sent by an unknown cult to recover witches' artifacts which led her to her encounter with Mario and Riba. She is what is known as a "Dreamwalker", a being who can manipulate people's dreams. She is a mischievous witch who enjoys toying with others as seen when she interacts with Mario in routes where Riba is not his ally, and she has been shown with a sadistic streak.