616 Universe's Features

Microverses aren’t worlds within worlds, but worlds beside worlds https://imgur.com/a/3wWXHA2

A Higher Plane, where the 3D World looks like a comic https://imgur.com/Tfm0mrC

The Djalia Plane https://imgur.com/a/B2sLPRJ

The Astral Plane https://imgur.com/a/5qobdDo

616-Universe contains at least 16 KNOWN pocket dimensions/small dimensions https://imgur.com/a/aeuPyCH

It is based on M-Theory and thus contains 11 Spatio-Temporal Dimensions https://imgur.com/a/BFBHp2a

It is infinite/boundless in size https://imgur.com/a/yvVwbb2

So, a Universal being in Marvel can easily be Multiversal in finite-sized verses.

Multiverses' features

Realities/Universes/Timelines

Infinite timelines: https://imgur.com/a/YNWQm

Countless realms: https://imgur.com/a/3oiPtZF and Countless Hells: https://imgur.com/a/vR4HY5J

Realms are Universes https://imgur.com/a/OPQvg6f

Infinite worlds https://imgur.com/a/HQwowlb

Infinite Universes again https://imgur.com/a/lg640QR

Infinite Worlds and Realities https://imgur.com/a/cJA66Pd

Transfinite Universes https://i.imgur.com/hU9GzSr.jpg

Eternity ka Universe/Multiverse is transfinite https://i.imgur.com/oUvJqo0.jpg

Infinite continuum of alternate possible worlds https://imgur.com/a/CQZ742e

Countless possible worlds https://imgur.com/a/0q2J3FC

The Universes are separated by space https://imgur.com/a/MrSphJh where time doesn’t exist https://imgur.com/a/MrSphJh (2nd scan)

The space between Universes also includes Superflow https://imgur.com/a/DukaCS5 which is pure information

Every Universe connects to Superflow https://imgur.com/a/DZjRz1p

Each and every Universe/Eternity in Marvel is boundless in size https://imgur.com/a/yvVwbb2

Infinite Possibilities https://imgur.com/a/bfRbyTL

Planes/Levels/Layers of Existence/Reality and Spatio-Temporal Dimensions

4th Dimension https://i.imgur.com/Qp0OZef.jpg

6th and 7th Dimension https://imgur.com/a/SQloBP5

8th Dimension https://imgur.com/a/sO8vru0

12th Dimension https://imgur.com/a/Xe11e1q

13th Dimension https://imgur.com/a/m8oHXFe

18th Dimension https://imgur.com/a/o5GKYov

Infinite Dimensions https://i.imgur.com/UvalKLJ.jpg

Infinite dimensions stacked/layered next to each other, stretching across conceptual infinity. https://imgur.com/a/fDKkSJc

Beyonder fights Celestials on countless layers of existence https://imgur.com/a/fgcm2TH

Hundred levels/planes of reality https://imgur.com/a/EmzZc6Q

Thousands/Infinite planes of reality https://imgur.com/a/hKM5W4E

The Multiverse contains infinite levels and wave functions https://imgur.com/a/Di6AKMh

Transfinite levels of existence https://imgur.com/a/b3v0Zuf

Beyonder sees endless dimensions layered upon each other https://imgur.com/a/Z6WfPqt

Silver Surfer moving upward through 15000 layers of reality https://imgur.com/a/0exdeu7

Dormammu and Umar traveling to lower Universes and toying with them https://imgur.com/a/hfCU6MW

16 dimensional Super Space https://imgur.com/5oZ0yHU

Hyperspace (or what is called SubSpace http://marveldirectory.com/otherdimensions/subspace.htm) encompasses the Crossroads of Infinity or the Junction to Everwhere which is infinite-dimensional (and yes, they are mathematical dimensions) https://imgur.com/a/RsZtxTS

Infinite levels of infinity with each higher level being infinitely larger than the lower ones https://imgur.com/a/ix0hcYd

Reference to real-life theories

Quantum Mechanics https://imgur.com/a/sPtbHRX

Cho explains the Multiverse https://imgur.com/a/Di6AKMh

Schrodinger’s cat https://imgur.com/a/lupnVKv

Referenced again https://imgur.com/a/QHowVr5

Quantum Mechanics defines the Type 3 Multiverse, an infinite-dimensional Vector Space or what we call a Hilbert Space

https://en.wikipedia.org/wiki/Multiverse#Level_III:_Many-worlds_interpretation_of_quantum_mechanics

Georg Cantor’s transfinite series https://imgur.com/a/3NBbyjz and again https://imgur.com/a/ix0hcYd

Carl Jung’s collective unconsciousness https://imgur.com/a/aPbSRvB

For those who don’t know, Jungian world of archetypes, or what we call collective unconsciousness is not bound by space and time http://www.depthinsights.com/blog/an-archetypal-perspective-on-clinical-practice-a-summary-of-an-introductory-teleseminar-lecture-by-jungian-analyst-michael-conforti/

“It helps move past fears that prevent you from being who you are When you enter the world of archetypes you leave the outer world of space and time. The archetypal world is not bound by space and time: it’s not just about your mother and father but also about archetypes that encompass the world of mothers or fathers. It’s an orientation, a destiny.”

Neoplatonic theory of microcosm and macrocosm https://imgur.com/a/qhREp2Z

Explanation of Neoplatonic cosmology https://www.youtube.com/watch?v=QvWGXXTk5UE

Basically it considers the cosmos as an emanation from a single source, and since all things are the extension of this ‘source’ they are all interconnected to each other

Star Chamber

The place from where Living Tribunal’s servants, the Magistrati arbitrate https://imgur.com/a/yEljlKc (2nd scan)

Every member of Magistrati gets his/her own ‘Omniversal Wardrobe’, an infinite closet which holds special uniforms for arbitrating in every planet across all creation https://imgur.com/a/XaTQAoE

Overspace

Apart and above all realities https://imgur.com/a/C9ZitZP

Accessed by growing larger beyond physical existence https://imgur.com/a/FL5Seo0

The realm of cosmic entities https://imgur.com/a/h7R5rNb

A place that encompasses all of creation https://imgur.com/a/tJ0QpJG, and is beyond all temporal existence https://imgur.com/a/VfC7oDl, beyond all things real and imagined https://imgur.com/a/unL9shs

Nexus of all realities

The source of all creation https://imgur.com/a/PvmSiz0

From which everything comes, and to which all things return https://imgur.com/a/93Wyj6G

Connects to every Universe, dimension, and plane of existence https://imgur.com/a/zVb4vMl

M’Kraan Crystal serves as a Nexus of all realities as well, its interior isn’t bound by space and time https://imgur.com/a/LqLC3Xo

Superflow

It’s the space between realities https://imgur.com/a/SrE1EFt

It is all information https://imgur.com/a/DukaCS5

The highest level of existence, where metaphor and reality collide, where concepts make war https://imgur.com/a/JKfkPdY

Neutral Zone/Exo Space and Outside

Basically the ‘gate’ to the absolute outside https://imgur.com/a/cpswlre

Beyond everything https://imgur.com/a/YiU5PH0

Beyond even imagination, life and death https://imgur.com/a/sPnk3MK

The no space beyond everything https://imgur.com/a/abL7zwX

A place that transcends all dream and reality https://imgur.com/a/bpVumpf

Eternity is only visible from this absolute outside https://imgur.com/a/choOVxr

Myriad Multiverses https://imgur.com/a/syeDOsb

Continuum of Multiverses is the Omniverse https://imgur.com/a/hlfPy4B

Goblin Queen says she will conquer all Multiverses https://imgur.com/a/EKWZm

Earth from another Multiverse https://imgur.com/a/FgfQWUc

Mega/Omni versal stuff https://imgur.com/a/XZDeavO https://imgur.com/a/1EbHKNd

Again https://imgur.com/a/XgtQSIX, again https://imgur.com/a/fDKkSJc and again https://imgur.com/a/0NN7bdl

Even in recent comics, ‘Multiverses’ is still a thing https://imgur.com/a/3h5XFqK

Confirmation from Al Ewing https://www.newsarama.com/26688-the-ultimates-get-pretty-damn-cosmic-in-new-ongoing.html

Infinite realities are born every infinitesimal moment and further create additional infinities, so on, ad Infinitum (infinitely) https://imgur.com/a/HWnP9aw

Every dream, thought of every sentient being, living or dead, creates limitless Universes https://imgur.com/a/sPtbHRX;

Confirmation of the above by TLT https://imgur.com/bDTfgdC

In simpler words, the Marvel Multiverse is a transfinite-sized infinite-dimensional infinitely-ever expanding Mega/Metaverse