I've been wondering about this, but it seems that he is becoming a nezarec, since the curse causes his consciousness to temporarily take over Mithrax's body.
So, it is possible.
Can you resolve this doubt for me? please :).
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I dont think so only because nezarec is able to exist without having a physical body. After we defeat him & he turns into that chrysalis he addresses the player. The lore from season of plunder states that nezarec was able to corrupt many people without having a physical body. Those that held actual pieces of his body were corrupted as well. I think whats happening with mithrax is similar to what happened with rezzyl azir becoming dredgen yor.