Vtubers are streamers who assume a persona and don’t show their face. Usually a computer generated model will be used instead of a regular face camera. They use tracking tech to make the model mimic their movements. Ironmouse is a popular vtuber.
Dream is a minecraft youtuber who hid behind a persona too, though they didn’t have a vtuber model - they just didn’t show their face. He had a ton of fans being enamoured with him, up to the point of obsession. He then decided to do a face reveal, which wasn’t really met positively.