Nemesis (ネメシス, Nemeshisu), also known as Master Nemesis, is a character introduced in To Love-Ru: Darkness. She is a transformation weapon, much like Golden Darkness (Yami) and Mea Kurosaki, but does not share their genetic origins. She is Mea's master, whom she gives orders and uses to observe Yami's changes and recent life. At the beginning of To Love-Ru Darkness, her original plan was to make Yami return to being the heartless assassin she was before arriving on Earth and she convinced Mea that this was the only life they were meant to live as weapons. Due to her catalyst-like role in the overall plot, she is considered the central antagonist of To Love-Ru Darkness.