@AzQth I believe because I like fiction to be able to change the stories, characters and events to my liking and benefits and to have the powers that I want to have all the waifus that I want and I will want and to manipulate the omniverse I can achieve that and more by being the sworn judge and executioner , the possibilities are endless

I like idea of boundless inner/world .

Omniverse allow to make variation of alternatives ,imaginable results .

Scale and potential is very creative and unfathomable and manipulation of that domain is heaven for experience and experiments.

I can direct whole totality of omniverse to certain result to obtain best possible results . As example of these results I can name: transcendence of omniverse, limitless potential of development or random manifestation of things that surpasses omniversal possibilities.

What if I want to make civilization that develop to passive reality warping without any efforts.

Develop magic that bypass any laws and obstacles and perfectly work without conflict with any environment.

Build mind that can't be named other that impossible even for absolute level.

Make such a challenge that even my omniverse will overheat from tasks that I installed.

It’s the omniverse obviously I’m going to be a tyrant🤷‍♂️ I mean it might depend on my mood when I acquire the power.

@Necropolis00 @Heartless Frost @Mr. Saggo Ramer @TheDevil7777 Do you mind if I ask your reasoning?

Here's my reasoning!

The Omniverse is the collection of every single universe, multiverse, megaverse, dimension (alternate or pocket), and realm. This includes not only Marvel Comics, but also DC Comics, Image, Dark Horse, Wildstorm, Archie, Harvey, Shueisha, Boom Studios, Rebellion, Dynamite, IDW, Graphic India, Derby Pop, Vertigo, Oni Press, Udon, Valiant, Kodansha, Shogakukan, and every universe ever mentioned or seen (and an infinite amount never mentioned or seen) including our own world. Everything is in the Omniverse, and there is only one Omniverse. According to the Official Handbook of the Marvel Universe: Alternate Universes, "It includes every single literary work, television show, movie, urban legend, universe, realm, etc. ever. It includes everyone from Popeye to Rocky Balboa to Ronald Reagan to Romeo and Juliet to Luke Skywalker to Snoopy to Jay and Silent Bob, etc." This also includes universes outside of American and European western comics, such as Dragon Ball, Naruto, Bleach, One Piece, Ghost in the Shell, My Hero Academia, Sailor Moon, and etc. The Omniverse is EVERY reality, including those published by all other companies. Even fan-fictions, cancelled works, mere fantasies, wishes of thoughts created by people, future comic book publishing companies, and fictional universes yet to be published are considered part of the Omniverse; simply put, the Omniverse is every version of reality and existence imaginable and unimaginable. Even existence and non-existence.

@AzQth Metaphysics Manipulation is all about the metaphysical. Well, the concept of a multiverse fits into metaphysics. Consciousness, infinite worlds, the soul, and more. Metaphysics Manipulation is expansive. Not that Omniverse Manipulation isn't, but it is a concept that could, in theory, be covered by metaphysics. The nature of Omnipotence is a part of it as well. To put it in my terms, it covers everything beyond the physical and the knowable.

@AzQth

I don't have any reason. I chose based on one thing: intuition.

If that doesn't satisfy you as an answer, I'll try other words. All universes, possible or not, existing or not, have their own concepts, fundamental forces, truths and rules. Including what is metaphysical and the different interpretations of it. I'm wrong? Or should we limit what an extraordinary power like Omniverse Manipulation can or cannot do with our limited human minds and our "logic"? Of course, the same goes for metaphysics. On the other hand, Omniverse Manipulation is not limited to anything beyond our physics/science. It also includes the entire totality. And this, in my shallow understanding, is more versatile.

Now what would I do with it? My own omnilocked totality I would create and spend eternity exploring diverse realities/universes while collecting infinite experience. Is this what I would actually do if I received Omniverse Manipulation? Perhaps. I'll leave it to your imagination, and mine, to deduce.

Do we inherently have omnipotent status with Omniverse manipulation or not? Or can we just have it and still be a mortal human

All good reasons. It feels like a part of what this comes down to is the actual extent of metaphysics; many verses have their own versions of metaphysical phenomena, as @Mr. Saggo Ramer pointed out, and Omniverse Manipulation would naturally hold dominion over all of these. The question then seems to me to be whether these individual metaphysical aspects collectively represent the whole of metaphysics or if the scope of Metaphysics Manipulation extends to anything and everything encompassed by the purely philosophical inquiry we call 'metaphysics'.

If the former is true, then Metaphysics Manipulation would reasonably be lesser in scope (though likely still capable of anything any human could actually conceptualise) than Omniverse Manipulation due to being restricted to the metaphysical components of universes/multiverses/realities/etc in the omniverse already, which Omniverse Manipulation naturally has dominion over, can surpass and can create and control things beyond.

On the other hand, if the latter is true and Metaphysics Manipulation deals with anything that falls under metaphysics as a philosophical inquiry, then its scope is naturally far greater than the previous case. I mean, even the omniverse could reasonably be considered to fall under the category of metaphysical cosmology, making the omniverse potentially covered by metaphysics, as @Necropolis00 suggested, and questions regarding what it means for a world to be 'possible', 'impossible' and 'actual' are entirely within the domain of metaphysics. For instance, Modal Realism holds that all possible worlds are as real as the actual world (where we live) and that the idea of an 'actual world' is not a statement of 'this world is real', but rather a statement about the world being the one we occupy, and Extended Modal Realism extends this to include all possible and impossible worlds. However, both of these also assume that all different worlds are spatiotemporally and causally isolated (i.e., there can be no interaction between them), which does make them different from the idea of the omniverse due to even the concept of Omniverse Manipulation necessitating the possibility of interaction between all possible and impossible worlds. In any case, the point still stands that the idea of possible, impossible and actual worlds is a subject of metaphysics. In any case, metaphysics may (though definitely not certainly) also go beyond the omniverse in its scope, due in part to various ideas such as Emanationism, Ultimate Reality (both of which are terms that are listed on the page for Alpha Reality under 'Fiction-Specific Terms', though whether they are actually equivalent is debatable), the Absolute and Transcendence all being considered to be under metaphysics in varying capacity. Again though, I would say that whether this entails powers like Absolute Manipulation is highly debatable.

In general, I would say that most representations of Metaphysics Manipulation seen in fiction fall under the first interpretation, but the definition of the power on the page entirely allows for the second interpretation (it also seems to be the one assumed by the applications, though I've never been massively fond of taking a power's applications as totally accurate).

Having said all that, regardless of what interpretation of Metaphysics Manipulation you go for and how far you think it reaches, both powers can basically do anything any human could conceive of, and more.

@Abdalla1234 Omniverse Manipulation, as I see it, is just that; manipulation of anything and everything within the omniverse, and of the omniverse as a whole. This definition would not seem to inherently entail a state beyond mortal human unless you choose to do that to yourself. Of course, I would have thought that some kind of alteration (e.g., increasing your mental faculties to omniversal scales) would be necessary to use the power to its full potential, but if you're not wanting to manipulate the entire omniverse all at once, I see no reason that scale of mental increase would be needed.