Shinobu Oshino is a fictional character from the Monogatari series, created by Nisio Isin. She is a vampire who appears as a young girl with long blonde hair and yellow eyes. Initially introduced as a mysterious and quiet character, she has a complex backstory that reveals her past as a powerful being. Throughout the series, Shinobu often interacts with the protagonist, Koyomi Araragi, and plays a significant role in the narrative. Her character embodies themes of immortality and the consequences of one's actions, making her an intriguing figure in the Monogatari universe.