Captain Atom

Captain Atom gained the ability to control huge amounts of energy when he arrived in the Quantum World. This has absolutely no energy. The protagonist has used it for several purposes, including an attempt to fulfill his desires.
Due to Captain Atom’s strength and toughness, Superman must work extremely hard to harm him. His power and resilience are unrivaled in the world. Captain Atom’s additional abilities allow him to overcome Superman even in the absence of kryptonite. But the battle would be severe.
Scarlet Witch
Scarlet Witch has proven her prowess by proving that she can compete with the best Marvel opponents. Scarlet Witch made a convincing case in Doctor Strange in the Multiverse of Madness that she could easily overthrow the Illuminati. The movie also features a spoof of Captain Marvel, who is beaten by Scarlet Witch after ingesting her powers.
Kal-El could do the same with Wanda. Given that the Sun is the source of all of his power, it will be interesting to observe how she chooses to weaken him. Even without her ability to modify reality, her chaotic magic attacks him. His weakness to magic will be more than sufficiently hurt by her blows. The Kryptonian is obviously not a pushover, so who wins control first will determine how the fight turns out.
Doctor Manhattan
One of the few superheroes on Earth with the ability to transform into a frightening force of nature is Jonathan Osterman. A nuclear experiment gone wrong had obliterated his bodily presence. The only thing left was his exuberant enthusiasm. Doctor Manhattan was later produced as a result.
Dr. Manhattan possesses scary abilities. Naturally, Manhattan was able to overcome Superman without the use of kryptonite. Superman’s natural fearlessness surprised Doctor Manhattan, yet even so, he defeated him in their Countdown Clock battle without ever raising a fist.
Vision
Superman is familiar with robotic beings because of his encounters with Brainiac. On the other hand, vision is totally distinct. He is stronger than most people think since he has the power to alter the density of his body, making it as heavy as stone or as hard as steel. He has defeated cosmic entities, yet his energy blasts might be extremely dangerous.
Another important advantage is that Vision’s ability to turn invisible would allow him to avoid a lot of Superman’s blows. If he wanted to, he could possibly kill Superman by just reaching through his body and seizing his heart. Don’t mess with your vision, please.
Captain Marvel
It will be challenging to convince others of this given that Captain Marvel unquestionably possesses the psychological defects of the Good Samaritan. However, due to their similar amounts of power, endurance, and expertise, neither will run out of gas anytime soon.
Only Captain Marvel can use energy absorption to beat the Man of Steel. The Kree-Human hybrid Captain Marvel is a cosmic-level superhero who has conquered far more difficult obstacles. Superman is definitely the strongest person alive, but if Captain Marvel can somehow harm him, it’s game over for him.
Thor
The God of Thunder was a past opponent of the Man of Steel. In a bloody conflict with the JLA/Avengers, Thor and Kal-El took part. The battle had already been lost to the Kryptonian before he hoisted Mjolnir and also grabbed it in midair.
Kal-El won in that battle. But at the end of the story, Thor tells him that he was unable to raise the hammer again and that Odin was the one who had given him permission to do so. Thor was gracious in conceding defeat because he was aware that he wasn’t actually trying to win. Thor is reportedly the hardest opponent The Man of Steel has ever faced, according to The Man of Steel.
Professor X
Superman might be faster and more strong than almost all X-Men, and if required, he could likely wipe out the whole Xavier’s School for Gifted Children. His intelligence, however, is another story. One of Superman’s greatest fears, he has acknowledged, is falling under another person’s authority. It has been established that he is susceptible to telepathic attacks.
Thus, he might be defeated by the most potent telepath on Earth. Therefore, he might be defeated by the most powerful telepath on Earth. Although Xavier tries not to abuse his powers, he might be forced to do so if Superman comes into contact with him in order to divert him. Xavier might succeed in a cerebral battle with ease; Superman might prevail in a physical battle.
Doctor Strange
Over Superman, Doctor Strange has a tonne of advantages. He is a master manipulator who has the power to alter reality. He is the best sorcerer to ever exist. Superman would be forced to take the harm since magic is his natural weakness.
Doctor Strange also has a lot to offer. By just analysing the millions of realities where Kal-El loses using the Time Stone, he may conjure a terrible situation that would destroy the Man of Steel.
Doctor Fate
One of the first superheroes to obtain the Helmet of Nabu and change into Doctor Fate was Kent Nelson. The Amulet of Anubis and the Cloak of Destiny, which would equal Superman’s might, enable Doctor Fate to do amazing magical feats.
Superman has frequently triumphed simply by outpacing Doctor Fate in a race for time. Doctor Fate is one of the most powerful spellcasters in the DC Universe, and since he has the time to create the necessary spells, he would be able to counter all of Superman’s strikes due to Superman’s weakness to magic.
Ghost Rider
The fascinating Ghost Rider would be a Superman opponent. His most infamous technique is the Penance Stare, which makes a person experience all the pain they have inflicted on others. Ghost Rider has superhuman strength as well, and his mystical flames would injure Big Blue more severely than regular fire, even though they might not work on someone as honourable as Superman.
His chain functions as a lethal weapon, and his motorcycle doubles as a devil’s hammer. Ghost Rider continues to attack Superman despite being able to withstand his blows. He may treat Superman cruelly, as evidenced by the fact that he once temporarily ruled over Hell.
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