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I think… the question Guda brings up, as a character, is what makes a human?

Guda at the beginning of the story is basically a normal guy. They've got a few canon character traits already (is really chill with Drake even if she's a pirate, is willing to fistfight Mordred for being rude to Mash, is SILLAY at times, ect) but generally speaking they're a perfectly fine and normal lad most people can project on. But as the chapters go by they grow increasingly unhinged and unstable. They were certainly human when it all started, but what of now? Are you still a human when you’ve killed thousands to survive? Are you still human when you can barely imagine a life outside of this box and its hundred ghosts? Are you still human when you used your own lifespan as fuel to shoot down gods? Are you still human when you try and succeed in reaching an understanding with beasts outside of humanity? Are you still human when you look at the likes of Cu Alter or Ereshkigal and wholeheartedly call them your kin? Are you still human when every new person you meet doubts that fact? Are you still human when you don’t die when killed? Are you? Are you? Or are you a hero, a monster, an animal, an ideal?

Despite everything, so far Guda’s response has been to stomp their foot down and say yes. I am a human. I consider myself a human, and that makes me one, no matter what else happens.

In Spishtar's wise words in her event: the only thing that determines if a person is a god or a human is how they feel about it.