Tubbo creates Ranboo in a world of humans (Or Ranboo creates Tubbo in a world of enderpeople?), being the first person to be able to make a fully independent, conscious artificial intelligence. 

'AI' not referring to robots, instead a fully functional creature with organs, with its own life. 

dialogue ideas:

"You were just an experiment."
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"What? Is it not normal for a guy's arm to fall off?"
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"Listen, they-," character jabs finger/claw out a window, towards a crowd of people, "don't know you. You can't just walk up and greet them."

"You're just being an introvert, come on-,"

"[name}, no."
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"Okay, and? I thought this was meant to be difficult."
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"Not to worry! My tail-- it's fake! It just, uh, fell off, sorry!"
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"Me? I'm a(n) [enderman/goat hybrid], duh!"