Mayu Iizuka sheds her soft-spoken personality and starts cackling, screaming and waving wildly in a makeshift studio in Tokyo as her avatar appears on a livestream before hundreds of fans.
Virtual YouTubers like Iizuka, who voices and animates a character called Yume Kotobuki, have transformed a niche Japanese subculture into a thriving industry where top accounts can rake in more than a million dollars a year.
