So guys. I put a lot of effort into this. I give you, what I consider to be the most powerful characters in all of fiction:
Dr. Manhatten: Has created life, can see into the future, is basically a God, can change time, warp reality, etc.
Superman One Million: Can warp reality, has 17 senses, hypnotism, was able to punch the time barrier so hard, a woman in the future felt it, faster than a tachyon, holds back a galaxy, all this other bullshit
The Saint of Killers: Survived a nuke, killed both God and the Devil (and all of the angels in Heaven. All of them), has guns that will never miss and bullets that will always be fatal (Except for Vampires for some reason).
Jesse Custer: Has the voice of God, can order anyone or anything to do whatever he wants. He has stopped the Saint of Killers before.
Batman (Maybe): Has beaten the 4 members of the Justice League in a 4v1 alone, defeated Superman, Aquaman and Deathstroke in fair 1v1s while being only a human, created artificial life, survived punches from supposed Gods, etc. Has also created tech that can withstand black holes, survive blasts from Superman's vision, and teleport people from one place to another.
Doomsday: Has killed Superman, was faster than the Flash before, took down Darkseid, etc.
Thor (Maybe): Survived the suction of a black hole, is apparently faster than light, has beaten Gods, etc.
Godzilla: Blew up the earth, survived the suction of a black hole, defeated 10 monsters in a row in Final Wars, has beaten planet busters, his Spiral Ray only took a few hits to destroy a creature that has survived 7 supernovas, a black hole and a white hole. His basic Atomic Ray is around 2.3 gigatons of force. (According to Death Battle, 328 trillion psi (or 2,243,376 gigatons of Atomic Force). If Godzilla were to melt down, he would apparently destroy the universe. Lastly, in a crossover comic, a weaker version of Godzilla defeated the Hulk, matched Thor's strength and almost defeated the Avengers and the Fantastic 4.
The Spectre: Is basically omnipotent, immortal, time travel. What else is there to say?
Goku: Can destroy 100 planets around the same size as Earth, can destroy solar systems, Can fly 200x the speed of light or some shit, etc.
The Anti-Monitor/The Monitor: Beat Superman with ease, casually survived an explosion that wiped out a galaxy, can wipe out entire universes,
Squirrel Girl (Maybe): Beat Ego the living Planet, defeated Thanos, defeated Pluto, defeated Captain Falcon, old Steve, Black Widow, Hawkeye, and Spider-Man in 26 seconds,
Galactus: Survived the Big Bang, one shot the Red Hulk, can shatter a planet, creates a blast that can cover 3 solar systems, can eat planets, y'know. The usual.
Cthulhu: Can't die, is a God, has lived on for millions upon millions of years.
The Hulk: Can lift planets, at his most basic level, he has the power of a nuke, can hold 150 billion tons, his punch can heat up the cosmos, and all that jazz.
Mr. Mxysptlk, Nosyarg Kcid, Bat Mite and all the other trans-dimensional beings: Can warp reality, kill Superman, is immortal, can destroy universes,
Bill Cipher: Can take out the entire universe if he's at full power, can warp reality and time, can destroy earth, etc.
Wander AKA Tumbleweed: Has a magical hat that can create anything if the hat is tortured. Yes I know it's ridiculous to put him on this list.
If I had to put them in order from least powerful to most:
-The Saint of Killers
--Mr. Mxysptlk, Nosyarg Kcid, Bat Mite and all the other trans-dimensional beings
-Superman One Million