[@Major Ursa]
So I'm a bit torn between making a human and making a monster. I've got an idea floating around for both, but the indecisiveness is strong in this one. Sooo...why not ask questions, yeah?

Around what age range should the humans fall under? Since they're divers, I'm assuming they're not children (but hey, weirder things have happened, no?). Should they all be younger, or is age not really a factor here? 

Would any of the monsters have seen humans before the first dive team? Or even know what humans are? How about humans, would they be aware of monsters being a thing, or would they treat them as just legends, myths, and the like? 

Are the monsters aware of how to break the barrier, assuming the method for breaking it is the same as in Undertale?