I think fantasy is kind of a given, but I’m not sure if it fits the adventure tag; in an adventure, anything can happen; you’re your own person, and you could encounter plots, perils and friends along the way. In this, you know your purpose; everything is set out with an underlying goal. Not to mention that the majority of the story (so far) is set in or around Olympus, so it’s more of a bottleneck story (again, so far) than an adventure.
I’m not sure what you plan to do with the odysseys, but as long as you take certain liberties, I’m sure they could be held to the adventure tag.
Aeson kind of exists to be the hero, so I don’t know if he’s applicable to real life, but (and this is my personal opinion) the other characters are kind of one-dimensional; they act how they’ve been told to act, and they have one personality and nothing outside that i.e. no deep emotional fronts, feelings or personality traits that they may be keeping under wraps. Of course there are many hints to this happening, but I feel like it’s isolated to the gang and not many else. They could exist outside of the plot, probably; but I think they would struggle outside of Olympus. Although, to be fair I only have one or two playthroughs, both of which are quite similar in terms of plots and RO’s, so there may be dialogue that I’ve missed that render this feeling null and void. Consider it me not doing my research in this particular area.
Now, I feel it prudent to mention two things: the first is that this is entirely within the context of the story; the discussion of the thread has provided us with masses of emotional theories and feelings that are applicable, some of which you’ve given us yourself, but I only mention it because it isn’t shown in the story to my knowledge.
The second is that…we’re really early in the game so far; literally everything I’ve just said could be disproved later in the story, or even in the next update. It may even be disproved even sooner than that by others.
The explanation for the Essence is (to me) relatively straightforward in its origins. The one snag is that the Essence itself is relatively vague; I recall numerous discussions about what we would do with our omnipotence only to find out that we weren’t actually going to be all-powerful. I don’t even know if we will be now, but that’s nobody’s fault except for mine, probably.
So there are the answers from my POV; please don’t smite me for all the negatives, I legitimately adore this story. As history has dictated.