Imma answer tomorrow. Gotta go sleep so good night

1. Objects don't have perspectives they don't have minds or organs that can perceive anything, to give them perspectives you would need to give them a mind and a soul that can process sensory information

2. It can be anything, 1st person, 2nd person, 3rd person, 1D, 2D, 3D, 4D, 5D, less colors, more colors

3. They would see the void beyond creation and could die if they are not prepared since most of the time it has a corroding effect, idk what the totality would look like from the outside

4. It would be like google street view or a VR game, but super trippy since it could contain things that they couldn't comprehend since their brain is still of a lower dimensional being, idk if they can bypass that

@Nicholas8293 Regarding the first one, I would point out that, similar to how Meta Variable Manipulation can manipulate the variables of things that don't conventionally have variables, Meta Perspective Manipulation can manipulate the perspectives of things that don't conventionally have perspectives. They "can manipulate all perspectives, even those that normally don't have them or are totally outside of them. They can apply perspectives to things that normally have no point of view, including dreams, abstract qualities, memories, data/information, numbers/counting, alien/impossible/nonexistent things/objects/properties, complete nonexistence/emptiness, abstract phenomena, etc".

This is, obviously, a very counterintuitive idea, but I find that makes it interesting to think about.

It's kinda useless if they can't do anything with their perspective, even if you somehow did give them a mind and soul they would basically be like a baby when they are first born unless you give them knowledge too. it might be useful if it had something like a spirit like some machines do, but it should be rare.

1. I guess it depends on the object in question. For example, if a boulder is about to hit you, you could alter its perspective into you're made of steel and it will break as soon as it hits you.

2. A new perspective could have various effects, for example, you could make yourself immune to concepts, rules, or even absolutes.

3. Perhaps the only one who has this perspective is the Omnipotent.

4. I think he may see far beyond reality but may have some difficulty understanding.

1 - I never really understood the bit of altering the perspective of anything that wasn't sentient. Although it's like you said above its probably similar to how Meta Variable Manipulation does its thing.

As for what it would do I assume they change how reality/existence "views" the object as well as how the object "views" itself or maybe by changing how the object "views" itself they enforce the new "view" onto reality. Assuming neither of those have sentience, I think "viewing" is just a placeholder that allows us to express/describe the aspects and attributes of the aforementioned entities.

By changing how a rock "views" itself you change the rock itself. Similar to how you can change the rock by changing how you view it. It can go from being a naturally occurring inorganic material to being an artificial organic material while still retaining its identity as a/that rock or changing it to being a synthetic material which it now fits the description of.

I'd honestly just change my own perspective of an object if I wanted to change it. You might also have to use Perspective Designing to give the object a perspective if it doesn't already have one.

Ooo or maybe the perspective of an object is the collective sum of every perspective that others have on it or at least the commonly accepted one.

2 - I think creating a new perspective gets all its power from the ability to have that perspective enforced onto reality. Since whatever opinion/attitude the user has becomes reality, the creation of new perspectives creates new things that become a part of reality or define it.

As for what happens they all become a new truth that reality must conform to.

3 -In the first case I assume it gives something the ability to exist outside of everything and in turn view absolute everything.

In the second case it gives them the same ability as the first one except the ability to exist outside of everything as the only thing that was changed is the "location" of their perspective. So, they can see all of existence kind of like a bird's eye view of everything. However, they themselves don't exist outside of everything only their attitudes/views on everything. (If they were their own perspective, they would then obviously exist outside of everything)

4 - Same as the above, changing your perspective to exist on a higher plane would probably only let you view that plane and everything below it. However, as your perspective is absolute it also lets you freely control everything in that reality. The same for the second scenario in question 3. If you existed as your perspective (idk Perspective Physiology) then you would exist on a higher plane but if you were an entity that wasn't a perspective, then it just allows you to view and control higher planes. In my opinion normally a lower existence wouldn't be able to even comprehend higher planes of reality let alone control them. When shifting your perspective to a higher plane you gain the ability to comprehend that higher plane as well as complete control over it.

As for SCP they would have full control over narratives below their current narrative as well as full control over their current narrative as they can have a view/opinion on it. It's actually a pretty cool cheat for the SCP verse normally you're limited to treating lower narratives as fantasy but with this you can even treat your current narrative as fantasy.

Idk if those answer all of them but ye thats my thoughts on it. I'm too lazy to reread all that and check for mistakes so lmk if you find ones that you can't figure out.

1). I think it is just what you said long ago about Thor's hammer. For example, take a normal small rock and alter it's perspective to make it so that in the rock's perspective, you are not worthy of lifting it, so when you try to lift it, you won't be able to. However, this can depend on the power level of the perspective alteration as it might alter it's perspective but not be strong enough to put it into action and sometimes it can be so strong that no one can waver the rock's perspective. To be honest, it might be similar to Programmable Powers or/and Programmable Matter.

2). I thought it was hard to understand this at first but it isn't that difficult to understand (i think), When I saw the page of Perspective Designing. Creating new perspective is or/and might be really similar to Path Making. It's basically creating a new/any point of view no matter the type, for everything/anything. In short, Creating perspective is equivalent to creating certainties. It's like what Hero's brother, from Big Hero 6 say, "look at things from a different angle". Honestly speaking, I dunno if I am right or wrong.

3). I am not certain but I think you would be able to perceive anything/everything in every possible way. It's similar to Reader Embodiment. If your or your created perspective is outside of everything, totality/everything will be like a book or a screen that you are viewing/reading in your perspective. Maybe.

4). Same as answer number 3 ^^^

@AzQth what do you think of my answres? (P.s they are NOT 100% correct. Only my opinion)

1.  I think altering an objects perspective would be altering reality as a whole. An object (in my opinion) cannot have a perspective for it isn’t real. However once you give it a perspective you are altering reality making the object real for now it has a perspective.

2. I believe the Creation of a new Perspective would be again just warping reality. However once you get to talking about Manipulating Perspectives on a Meta or Absolute level now we’re talking about having a Power/Ability far beyond or Comprehension.

3. They would essentially be like the Author of Existence, capable of seeing all perspectives from the Outside of Existence/Totality, similar to how an Author or Writer sees Outside of the book. They would be extremely broken because they could alter all Perspectives as well, allowing them to do anything by manipulating all Perspectives.

4. Same as answer 3 essentially.

Concepts,objects and living are all perceved by your own subjective perspective,power itself gives you ability to manipulate their definition and interaction amongst themselves in the nigh-omnipotent illusion of your creation, in the meta version illusion becomes omnipotent and aquires smilar nature to "boundless inner world"with both being extreme of inner eternity. is what I thought of it