Undertale - Mettaton's Pink Soul?

What's with Mettaton's pink heart? And are they a corporeal entity?
In this Undertale theory, we discuss a few possibilities! Spoiler warning!

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Curious about Gaster? Check out my video highlighting his mystery!    • Undertale - The Mystery of W. D. Gaster  

What happens to Frisk after a neutral ending?
   • Undertale - Does Frisk Die After a Ne...  

I also have a video on Sans!
   • Undertale - Is Sans a Human?  

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