Master Nemesis

Nemesis is sadistic, mischievous, domineering and mysterious. She believes that a transformation weapon's only purpose for living is killing. She is often seen hiding in the shadows observing Rito, his friends, and their daily lives through Mea, until she began to approach them herself. She also has an eery and erotic side to her and finds Rito's shyness arousing and would like to have him as her servant. She said that she doesn't have full control over her erotic personality and would act on it on impulse. Upon her first appearance, her erotic tendencies quickly earned an uneasy impression from Rito and a strong disdain from Momo. She can be quite patient, like instead of persuading Yami to return to her old heartless life, she decides to wait until she uses the "Darkness ability", believing that Yami will return to that path naturally and that the "Darkness" will inevitably occur regardless of Yami's relationships on Earth. Like Mea, she has a sweet tooth; she enjoys eating anything that contains Dark Matter. She is eerily optimistic and apathetic at all times, and whether things go her way or not, when she is not entertained, she does little to show any negative feelings for any reason. Even after Mea disobeys her and her plan to activate Yami's Darkness transformation failed, she does not appear to mind. And even after a fierce battle left her on the verge of imminent death, she expresses no regrets disappearing after all of the fun and mischief she had, as well as some relief towards the thought of her life coming to an end, indicating that beneath her childlike and bratty demeanor, she's a truly depressed and lonely being. It is unknown if Nemesis has feelings for Rito, but she enjoys being fused with him, as she teases him when the opportunity presents itself and comments that her life is now more interesting now that she is fused with Rito.

Nemesis is the main antagonist from To Love Ru:Darkness. She is the end result of a secret project of an underground organization named Eden whose purpose is to manufacture organic transform weapons to conquer with. Nemesis in particular was created with dark matter in mind rather than nanomachines like her peers, as well as being the only survivor of the project that created her. However she was deemed a failure and the project abandoned so she roamed as a thought entity until the organization was caught up in the Great Galactic War. When the organization was destroyed she later meets a surviving transform weapon named Mea she recruits as her pupil, soon enacting a plan involving awakening a dormant power in a sister weapon named Eve all for destruction. While her true form is a thought entity, she uses her dark matter to appear as a fairly tanned girl with long black hair and yellow eyes often garbed in a dark gown. Being a transform weapon she can manipulate her form at will, taking disguises as animals or other people as well as materializing functional weaponry like guns or blades. Her special technique "Trans Fusion" allows her to fully take over a person's body thus sealing their consciousness.