If the Multiverse is indeed infinite, and you would be you, with identical quantum states. Then there would be an infinite number of identical you's. The manyworlds interpretation of quantum physics gives similar results. However, we have:
Bass's proof, only one consciousness assuming QM
The Wigner's Friend thought experiment posits a friend of Wigner who performs the Schrödinger's cat experiment after Wigner leaves the laboratory. Only when he returns does Wigner learn the result of the experiment from his friend, that is, whether the cat is alive or dead. The question is raised: was the state of the system a superposition of "dead cat/sad friend" and "live cat/happy friend," only determined when Wigner learned the result of the experiment, or was it determined at some previous point?
Do I bring you into existence when I reply to this message?
Yes and no
We'll ask for a second opinion then.