Gender: Male Location: Stopping terrorism/WW3 in 12 hours
Most powerful beings I ca think of:
God (Morgan Freeman) for obvious reasons
God (Alainis Morisette) for obvious reasons
Anthony Fremont (Twilight Zone: The Movie) more powerful than his TV counterpart, he was dimension dumping people in cartoons, which would require multiversal power
Q (Star Trek) pan dimensional beings who are seemingly omnipotent and unbound by any physical laws
Pre-Retcon Beyonder- the entire multiverse was a speck to him. nuff said
Primal Monitor- same as Beyonder
World's Funnest Mxy- easily obliterated and recreated the multiverse
A. This is movie only.
B. Dimension dumping doesn't require "multiversal power" in the way you're using it.
C. PR Beyonder is considerably more powerful than everyone on your list except arguably the other comic characters.
D. Allowing non-movie media into this means movie characters wouldn't even make the cut.
Discounting all the dipictions of God, I suppose the answer is the Monoliths. They are the only interpretation of a Technological Singularity that appears to come close to it's actual perceived capability.
For instance, put Skynet up against it and everyone would instantly summise that Skynet and it's Terminators are not going to be any sort of threat. As stated in Versus thread even though the Monoliths are machines even Dr Manhatten would be incapable of understanding how they work.
They are machines that may or may not have a force shield, we just don't know and would never know as we cannot perceive them in any way except that of a visual clue. They look like black rectangles but the astronaught didn't know if he actually touched it, is that black rectangle a black nothingness? With no reflection of light is the black appearance akin to how black holes prevent all light from escaping? The one man who did see beyond the black exterior saw stars, millions of them. Are they using black hole technology? If so then unlike all other Sci-Fi and fantasy characters these machines do it without exhibiting any sort of energy drain, it is as simple to do for them as it is for a human to blink its eyes.
The only thing we know that could comprehend them was the Star Child, which the Monoliths created. Possibly even the species that created the Monoliths but that was not disclosed in the novels. Arthur C Clarke himself admitted he could not perceive them but that is the whole point, they are way out of our league and that of pretty much anything else that is not a part of them.
So Dr Manhatten wants a fight, what is he fighting? Has Dumbledorr and Co. ever come across a machine that turns planets to stars?
God would be the ultimate but I always believes the concept of a God as being a cop out, it is a bit boring where the answer will always be God.