I can only speak for myself... but my inner monologue is just a runaway train of thoughts that I vocalize in my head as I work through them. There is no other person in there, abstract or otherwise. Have you ever seen the Death Note anime? Similar to that.
replyI do what the person you're replying to and for me its just one voice or a faint imagination of them speaking. Its me roleplaying as the other person, not like there is a different entity in my brain.
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