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Full Kayfabe is best option for prolonged popularity. Pekora and FuwaMoco could be doxed as brown/married women, and their audience would be unaffected, because no-one thinks they are real.
If you want the parasocial $$$, like Pippa and Kiara, 50:50 is a good ratio. Dox yourself, and share as much personal info as possible, while maintaining the anime girl persona. When parasocial Vtubers hide info, a boyfriend fills the gaps.