Biscuit-tan is a fictional character originating from the 2channel (2ch) internet forum, part of the broader family of 'OS-tan' anthropomorphized mascots. Biscuit-tan represents the 2channel board's unique subculture, often depicted as a cute girl with biscuit-like features and a playful demeanor. She is a personification of the community's in-jokes and spirit, serving as an unofficial mascot. Biscuit-tan plays a role in uniting users with her charm and is a symbol of the site's creativity and humor.