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This seems like a robot hosted on the spot. And I have to honestly ask why a robot? I get the theme is to educate a robot to "escape" but it just seems so forced.
If this gets past a pilot I hope to go they change the voice of the robot. There is no reason RT should be using what sounds like the robot setting from this toy.
There are toy voice changers such as this that could be broken down and worked into a mask. Otherwise, there exist voice changer/auto tune apps for your phone, such as VOLOCO, which I found to be promising after a brief search. You could potentially wire a microphone and speaker into the mask near the mouth and hook them up to such an app.
Amazon
She is probably just using a normal mic with some other equipment or software used for singing but if you just want something to do that then the link is the best
Theres a cheap megaphone toy on amazon that does the pulsing lights and voice mod all in one. I'd like to learn enough about circuitry to design my own but this was quicker and easier haha https://www.amazon.com/dp/B000FK3WDC/ref=cm_sw_r_fm_apa_i_4eLYEbQ8HDB64
You might be able to find a cheap toy on Amazon and break it apart for the lights and voice modulator.amazon link Punished Props did a Sweeper Bot tutorial that had light up head and LED that fit your description
Can I interest you in our voice changing megaphones?
They are fairly loud to be sure but not deafening. Where they really excel is in evil, irritating, robot, demon voice department.
Now if you want an insight to my own personal hell, you need to find a toy parrot that repeats everything you say. The reviews for the quality on this particular one on Amazon are mixed:
But I swear to God it will drive parents insane. Kids will say something and it repeats what they say (twice!) in a high-pitched mocking tone. Once they run out of words, they just yell at the bird. The bird yells back (twice). Some of them have a button/switch where the bird will just keep repeating the last phrase you saved in its memory. My kid got it to save the parrot from Peppa Pig saying "AWWWK I'M A CLEVER PARROT" and played it over and over and over (this parrot: https://youtu.be/JRcJ-URp1jc?t=81)
So I bought this to use in my cosplay: https://www.amazon.com/dp/B000FK3WDC?psc=1&ref=ppx\_yo2ov\_dt\_b\_product\_details
I see variations of this one pretty much every time I go to a toy store: https://www.amazon.com/Toysmith-Changer-6-5-Inch-Various-Colors/dp/B000FK3WDC
They sound pretty cool.
Something like this?
He uses one of these
You should send her one of those voice changers, less than $10, you can't go wrong! Save the next poor sole who has to talk to her!
https://www.amazon.com/Toysmith-Changer-6-5-Inch-Various-Colors/dp/B000FK3WDC