I'd leave that up to the soul in question, I think.

[I mean, has anyone verified for sure that there aren't serial killer Yamasks...]

Although that actually answers another question I had: namely, why we can't die here. If monster souls and human souls are interchangeable - if one can just become the other like that - it'd make sense that we would be as strong as they are.

[He nods, decisively, more to himself than anything. Reaffirming.]

Yes, I like that! Thank you for the insight, darling. Do you have a name to go along with it?