Chiaki Mamiya is a fictional character from the anime and visual novel series Steins;Gate. She is known for her role as a time traveler and is a key figure in the story's complex narrative about altering timelines and the consequences of time travel. In the series, Chiaki is depicted as a determined and intelligent young woman who is deeply involved in the events surrounding the Future Gadget Laboratory. Her character adds depth to the themes of friendship and sacrifice, making her an essential part of the Steins;Gate storyline.