Origin
Io’s story begins with a young girl named Dan Bi. Her father had a antique shop. When her father came into trouble with Morgan le Fay, Dan Bi came into contact with henchmen of Morgan. As she fled, she found a mystic mask lying on the bed of her father. When she took the mask to her face, a strange bear-like entitiy named Io appeared and helped Dan Bi. Calling herself Crescent, she and Io vowed to keep one another safe.
Creation
Io was created Danny Koo, Bill Rosemann and Jeehyung Lee for the digital Marvel game Future Fight. His Comic book debut was in War of the Realms: New Agents of Atlas issue 1 (2019), by Greg Pak.