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We should probably define what kayfabe means in the context of vtubing because it definitely goes beyond just your lore, it's also based off of your model and the idea of your character in how much that differentiates from a typical streamer. Kayfabe chuubas can refer to their normal lives and do things like handstreams but these things aren't the norm and are usually done in a context that relates to the character:
Luna's arts and crafts streams are an example of this because while the gloved hand streams aren't in kayfabe, the arts and crafts aspect plays into her child like character and aren't in conflict with Himemori Luna. Luna's biggest claim to being a kayfabe chuuba isn't even sticking to the lore of her being the 0 year old princess of the Candy Kingdom but with her interpretation of what that means as a character, her specific interpretation is to have infantile gimmicks like a babyish voice and a verbal tic but she also has traits like a shortness of breath I'm pretty sure she was recently diagnosed with asthma which didn't come as a surprise, frailty, and a shyness that encouraged people to pamper her despite none of these being dependent on her character. If you watch old Luna streams and compare them to current Luna streams, you can really tell that she's become alot more comfortable with her character and can explore different ways and variants of it like the cheeky brat.
Kayfabe can be maintained without upholding explicit character lore as long as the visual character being presented on stream can be identified as a character with certain traits and the streamer plays into those traits through their own interpretation of them.