Is Hesher the personification of Metal?
He seems to be what you'd expect from the raw, unedited physical manifestation of Heavy Metal music. He seemed a bit stereotypical the first time I watched it, but on a second viewing I realized he's actually unique. No one could be like Hesher because he's not human, he's Metal in human form.
What do we get from Metal? A sense of freedom? Power? Do you feel alive, empowered, headstrong, rebellious etc when you listen to it? Does listening to it help you throw off the chains of society? Do you feel unstoppable when you're riding the lightning? I do.
But it's all in my head. If I could bring it all out I'd be Hesher. But no one can do that.