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It is cringe overenthusiastic, but a proper instructions/system prompt will fix that mostly

You can tell it not to talk like this using custom prompts.

One of the linked demos is it being sarcastic, so maybe you can make it remember to be a little more edgy.

tell it to speak to you differently

with a GPT you can modify the system prompt

It still refuses to go outside the deeply sanitise tone that "alignment" enforces on you.

it should be possible to imitate any voice you want like your actual parents soon enough

That won't be Black Mirror levels of creepy /s

Did you miss the part where they simply asked it to change its manner of speaking and the amount of emotion it used?