Counter point, ghosts powers manifest based off of their social malfunction, what they are is given away by how they act. For example Embers hair and fire grows bigger and stronger the more people call out her name. She isn't manifesting some aspect of humanity, her motivations are deeply personal and self centered.
Skulker is a tiny man inside a big suit, combine that with his desire to hunt and it's clear he's a man trying to compensate for personal insecurities through the bravado of trapping and killing powerful beings. If he was just a hunter without the tiny man with insecurities bit I could agree with you but he is shown to be petty and thin skinned, something a manifestation of the hunt wouldn't be.
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I can get behind Youngblood though, he just wants to play out a childhood fantasy and isn't vindictive so I can see it from your point of view even though I still think he is a dead kid.
A manifestation would be the embodiment of some base collective desire of a subsection of mankind, something like greed, anger, or even a thirst for knowledge. It wouldn't take things personally but simply be a physical embodiment of a concept.
Clockwork is a good example, he doesn't have a personal vendeta or is trying to compensate for something, he's a time-lord and all his motivations are around that.
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