Sophie Twilight is a central character in the anime series 'Tonari no Kyuuketsuki-san' ('Ms. Vampire who lives in my neighborhood'). She is a centuries-old vampire with a youthful appearance, living quietly in a modern Japanese home. Despite being a vampire, Sophie has adapted to modern life, relying on mail-order blood and avoiding harm to humans. Her character is portrayed as calm, composed, and somewhat introverted, yet she's endearing with her old-fashioned charm and fascination with human culture. Sophie becomes a close friend and housemate to the protagonist, Akari Amano, leading to humorous and heartwarming interactions.