The hierarchy is important but it's not at the same time, because people that are more down in the hierarchy don't even knowledge it's existence, but the people above it knows it.
Let tell you the details:
Hopeful is above everyone because he's THE HOPE, you should thank him just for existing.
Messiahs are people who help people across the multiverse, they're are sort of semi-gods, "blessed" by Hopeful, Neil uses his powers to organize the doodle-sphere avoiding it from crashing, Soul helps people in danger and bring them to Dreamtale. Both help Hopeful in a way.
Rich people are... self-explanatory, even thought dreamtale has socialist characteristics it also has capitalist characteristics (politics, out of nowhere, holy shit)
Icons are the people who represents a color in the rainbow system, and each color represent an element of harmony, which are 9 now: Empathy, generosity, laughter, humility, loyalty, honesty, bravery and... and magic... (is that an MLP FiM reference?????). They help to maintain the harmony inside dreamtale, while the messiahs do it outside dreamtale.
From dreamtale, weren't presented yet, even thought their designs aren't ready, without colors, i replaced some of Joku's OC's (that's not an offense) with undertale chrs, because... cuz' i wanted to :/. People from dreamtale are above Outsiders because they were born in dreamtale, they're "already blessed", they were born in "the paradise"
Outsiders are people from the multiverse, other AU's, rescued or not, that aren't from the rainbow system. They go there searching for a better life.
The drawings are kinda ugly but what matters is that it's showcasing the thing it's suppose to... if you did read that... i love you.
Credits:
Dreamtale, and the characters Dream, Neil, Grapes, and the concept of the characters Death, Life (Quetzacoalt) and Magic(Lanny) are by Jokublog
With how their whole positivity/negativity thing works (and that they're the only ones who can mortally wound each other), what if Dream and Nightmare aren't able to physically touch anymore?
Imagine, in the past, the brothers' main love language was physical touch (hugs, play fighting, etc). But after they ate the apples, the negativity and positivity act like poison to the other as a defense mechanism.
Any prolonged contact will burn Dream and make Nightmare's corruption boil and melt. It is extremely painful for both of them.
Imagine how this affects them in Parallel Synthesis.
When after all the fighting, after they've settled on a truce, after they've found peace and are able to actually be brothers again,
there will always be that one thing they can never have back.
Btw this takes place during the lunch meeting mentioned here! The stars and the gang decided to have an outdoors lunch :]