Ultimate Thor was apparently a more abstract type of god, who incarnated in human form to allow him to preach a message to humanity (a New Age pacifism that seems to be almost, but not entirely, unlike the philosophy of the Thor of Norse Mythology.) Ultimate Loki is more powerful than his mainstream counterpart, able to "reshuffle reality" at will — until Big Daddy Odin gets off his cosmic duff and makes with the spanking.
Also by Jack Kirby, the Ancient Astronauts/"Space Gods", the Celestials, and the Eldritch not-so-AbominationPlanet Eater, Galactus. While it's heavily implied that Galactus' true form is an immensely powerful Energy Being, he appears in a different guise to different races, with his default appearance seeming to be a huge armored version of his original humanoid self Galan. His non-canon daughter Galacta (no, really) is closer to a typical Physical God in terms of power scale since she isn't quite as powerful as her father. Her unborn child the Tapeworm Cosmic (no, really, again) will probably fit the bill, too.
The "cosmic entities" sometimes do, too, but they tend to go a bit beyond the average scale of a Physical God.
And then there's the Beyonder — if there's any limit to his abilities, we've not seen it. He didn't become physical until Secret Wars II, however.
So powerful, in fact, that when Doctor Doom takes his powers, he has a hard time separating his thoughts from reality. Doom has been this trope a few times.
Although the Beyonder fooled The Illuminati into believing that he is merely a particularly powerful Inhuman, he has been acknowledged as an incomplete Cosmic Cube by Kubik and the Shaper of Worlds, both former Cosmic Cubes.
And how did he become physical? He wanted to see what it was like to be a mere mortal, including being vulnerable. A lot of other nigh-omnipotent characters don't have nearly so much power over their own natures.
How powerful can Beyonders get? In The Avengers (Jonathan Hickman), a group of Beyonders called the Ivory Kings killed every other Cosmic Entity in the Marvel Universe, including the Living Tribunal.
In recent Marvel history, there's The Sentry/Void. Initially based on the idea of 'the world's greatest hero who is also the world's greatest villain', the manipulations of Norman Osborn led to the Sentry allowing the Void to do whatever he wanted, as perfectly described in Siege when the President is very accurately told that there is no limit to his power set (for an example, the Void's strength can scale from being able to break the Hulk's bones to being able to tear gods apart). The Sentry ultimately got a Mercy Kill at the end of Siege — which only worked because he wanted it — and after he was unwillingly brought Back from the Dead, went looking for another way to kill himself. Neither he or Doctor Strange could find one.
Shuma-Gorath is a nigh-omnipotent Multiversal Conqueror/Eldritch Abomination who has thousands of universes under his control, and he's just one of four Many-Angled Ones. The results of one of his more thoroughconquerings is... unsettling, to say the least. Oh, and he's back, and very pissed.
Dormammu is a lesser example; while he's a fair bit below Shuma's level, he's still a staggeringly powerful extradimensional horror who, like Shuma, has conquered multiple universes and is worshipped as a deity by countless beings throughout the multiverse.
His sister is, in turn, somewhat less powerful, but still strong enough to kick a Sorcerer Supreme's ass without much difficulty.
And then we have the "One Above All", also known as the author.
Gorr the God Butcher, a villain from The Mighty Thor, became one after he acquired All-Black the Necrosword. The sword made Gorr so powerful that he was able to murder entire pantheons of gods across the cosmos (hence the "God Butcher" part of the name). Even multiple versions of Thor from the past, present, and future couldn't defeat him until an energy construct Gorr created in the image of his dead son rebelled against him and aided Thor since it believed Gorr had become everything he hated: an evil god.
And now we have Angela, who was originally an angel in the Spawn universe, got transferred over to the Marvel Universe after an interdimensional incident, is now an Asgardian and sister to Thor and Loki, and still is insanely powerful, but is considered a mere warrior in their culture. With incredible angelic powers intact, of course.
When it comes to the physical side of things, one is hard-pressed to argue that the Juggernaut isn't one of these. He's the physical avatar of the Destroyer Deity Cyttorak, which makes him a living embodiment of "unstoppable force". In practical terms, he has Super-Strength off any charts the Marvel universe can come up with, he's nigh-invulnerableand has a Healing Factor that makes for good comparison with Wolverine, his only Achilles Heels are a vulnerability to mind-control and to magic (one of the few ways to physically hurt him), he is literally unstoppable (once in motion, nothing, but nothing, can actually stop him), and he is an Implacable Man taken up to eleven (he officially doesn't need to eat, sleep or breathe and his stamina level is "infinite", meaning he never gets fatigued).
Although probably retconned now, in The '90s, it was revealed that Gambit would have become one if he hadn't gone to Mister Sinister for preventive brain surgery. A version of himself from an alternate universe who never had the surgery forms a Big Bad, and shows Gambit would have eventually become a being of pure kinetic energy, with the ability to manipulate all kinetic energy at will. This alternate Gambit called himself "New Sun". Because, when his powers fully awoke, he accidentally triggered all potential kinetic energy across planet Earth, destroying it by accident.
Some "Omega-level mutants" often look like Physical Gods. Scarlet Witch, for example, has the power to alter probability. At its apex, we go from "give enemy bad luck" to "make the probability of anything she can think of become 100%," becoming a Reality Warper who is limited only by the fact that as one born human her mind can't always handle it.
Speaking of Omega-level mutants, there's Vulcan a.k.a. Gabriel Summers, the third Summers brother. He's one of the most powerful, if not the most powerful, mutants in the Marvel Universe.
David Haller, a.k.a. "Legion" (Professor X's Antagonistic Offspring) has the ability to create spontaneous mutations with varying attributes, potentially giving him limitless access to thousands of different power types, and there are more "being born" all the time. Due either to his immense powers, mental instability or a combination of the two, David creates a new sub-personality in order to govern each one of these new mutations, hence his codename. He becomes truly a god in material form when he manages to pull a Split-Personality Merge but his godlike status is questioned due to the instability brought on by the constant threat of a Split-Personality Takeover.
Nate Grey, a.k.a. X-Man, Cable's genetically engineered counterpart (and half-brother, since he was created from Jean Grey's DNA, rather than her clone's) from the Age of Apocalypse reality. He was born to "end the Apocalypse", as he puts it, and proves it on multiple occasions — starting at the tender age of 17. At the height of his powers, he was a psychic so powerful that reality warping was second nature, death was a mild irritation, and the dead could be resurrected with a stray thought, while the Multiverse was his personal stepladder. After exposure to the Life Seed, the entirety of the X-Men, including several of the above-mentioned Omega Class mutants, couldn't even touch him. He proved able to move tectonic plates, and when Legion (who was rightly terrified of him) finally faced him, the 'fight' was a curt speech from a supremely annoyed Nate as he shut Legion down, concluding with Nate effortlessly body-jacking Legion. All this while keeping Magneto and others on a psychic leash, and having Apocalypse in chains, the latter grudgingly admitting that he was "a ruler worthy of the counsel of Apocalypse". Then, he ended up creating the Age of X-Man, a whole new reality — not just an alternate universe (for one thing, he was that universe).
And then one must consider the Scarlet Witch's son Billy, a.k.a. Wiccan, a.k.a. the Demiurge, from Young Avengers. He's inexperienced now, but once summoned and killed an Eldritch Abomination, and will create utopian dimensions from scratch. His original codename may be foreshadowing his future status. It's Asgardian, by the way. And then, of course, there is this:
Loki: You're a singular multidimensional messiah. You're going to rewrite the rules of magic and all the implications of that decision are going to echo forward and backward across all realities. It's no biggie. [Beat] Billy:WHAT?
