Shiina Mayuri, often called Mayushii, is a central character in Steins;Gate. She is Okabe Rintaro's childhood friend and lab member of the 'Future Gadget Laboratory.' A 17-year-old high school girl with a distinctive side ponytail hairstyle, she carries a bag with dog leash-like straps. Known for her adorable, somewhat dim-witted personality, she loves cosplaying as a magical girl named 'Tutturu' and adores cute things like stuffed toys. Mayuri is gentle, optimistic, and deeply caring, often acting as the emotional heart of the group. Her tragic fate in many timelines drives the story's time-travel efforts.