Nemesis is a key character in the anime series 'To Love-Ru'. She is a sentient, shape-shifting entity known as the "Master of Darkness". Nemesis serves as one of the antagonists, often causing trouble for the protagonist, Rito Yuuki, and his friends. With her mischievous and playful personality, she enjoys creating chaos and testing the limits of those around her. Despite her antagonistic role, Nemesis exhibits a sense of curiosity and intrigue towards the human world, and her interactions often lead to humorous and unexpected situations.