Meaning chuubas who openly have simultaneous active 3D and 2D personas with or without the same name. Immersion is nonexistent but maybe you can see them in person at cons.

Ami Amami/Phoebe Chan - came out of the closet after disbandment of Prism Project, was active as Phoebe before Ami.
https://twitter.com/itsAmiAmami
https://www.youtube.com/@AmamiAmi
https://twitter.com/feebeechanchibi
https://www.youtube.com/@feebeechanchibi

Kson - Started as 3D streamer and added 2D model
https://twitter.com/ksononair
https://www.youtube.com/@ksonONAIR

Saurei - I think she has faceposted/facecammed a lot on the same account?
https://twitter.com/Saruei_
https://www.twitch.tv/saruei

Onigiri - Started 2D vtubing cooking on twitch, expanded to fleshposting
https://twitter.com/OnigiriEn_
https://www.twitch.tv/onigiri