Throughout fictitious power scaling, many tend to use DC Comic's Superman as a baseline to measure the strength of other characters. This is because ever since his first appearance in 1938, Superman has become the most iconic superhero of all time and has even become one of the strongest characters in not only his verse, but in comics in general.
Of course, over the years, many timelines and continuities have pushed Superman to become an external being, such as with Superman Prime or Cosmic Armor Superman. Although the regular version of this character is still impossibly strong, there are some anime characters that surpass him, so let's take a look at who they are.

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Sailor Moon is a galaxy-shattering powerhouse
Anime: Sailor Moon
While her kind demeanor and magical girl aesthetic may seem out of place in power-scaling debates, the truth is that Sailor Moon is an exceptionally powerful character who is convincingly stronger than the regular versions of Superman. This is because by the end of the series, she grows in power tremendously, and with her revered Lambda Power, she can even destroy entire galaxies. Also, her power comes from magic, which is one of Superman's main weaknesses.
Yhwach can see all possible timelines at once
Anime: Whiten
As the owner of the strongest ability of all Whiten series known as The Almighty, Yhwach is widely considered the series' most powerful figure. Essentially, this power allows Yhwach to perceive many different futures or timelines and manipulate them in a way to ultimately benefit him. This means that even if Superman massively scales him in any speed or strength, Yhwach can still always see him coming and, because of which he would manage to find a way to defeat Superman.
Touching Giorno Giovanna would be the end of Superman
Anime: Jojo's Bizarre Adventure, Part 5: Golden Wind
Jojo's Bizarre Adventure is a series filled to the brim with incredibly powerful characters and impossibly broken abilities, and on top of them all is Giorno's Stand, Gold Experience Requiem. Basically, this tripod has the ability to reset every action back to 0, only undoing every action or event once it occurs, effectively making this the best defense in fiction. If anyone tries to harm Giorno or the Stand itself, they are sent into an endless death loop where they die repeatedly in every imaginable way for eternity, aware of everything while it's happening.
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Sung Jinwoo becomes a multiversal being
Anime: Solo Leveling
As for where Solo Leveling anime is currently at the end of season 2, Jinwoo's total strength is lower than Superman's. However, by the end of the series, Sung Jinwoo becomes the most powerful figure in his entire universe, surpassing such rulers and monarchs and gaining access to a plethora of broken abilities. Eventually, he transcends time itself, and with his immense strength and millions of shadows, he was able to definitively defeat Superman.
Saitama was made to mock characters like Superman
Anime: One Punch Man
For as long as there have been powerful characters, superheroes and power-scaling in general, there have been satirical versions of them, with Saitama of One Punch Man be the greatest of them all. Despite being the protagonist of his series, Saitama is still a gag character whose strength and speed exist at impossible levels due to the fact that he broke his limiter. Now his power is unmatched in his universe, allowing him to defeat the strongest enemies with just a single punch, move infinitely faster than light, and even interact with things on other dimensional plains, making him more than a match for Superman.
Goku is Superman's best fictional match-up
Anime: Dragon Ball
For many years now, one of the best and most popular “what-if” match-ups in fiction has been Goku vs. Superman. This is because both characters are actually very similar, even in overall strength, which is why they are often thrown in together to see who would win. But all things considered, it's pretty obvious that Goku would defeat the regular, non-specialized versions of Superman pretty convincingly, especially considering how Goku displayed universal feats in his various Super Saiyan forms. Now, with God forms and Ultra Instinct in his arsenal, Superman would lose to the Saiyan pretty easily.

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The Anti-Spiral is way too good for Superman
Anime: Tengen Toppa Gurren Lagann
As the ultimate enemy in Gurren Lagann series, the Anti-Spiral is an enemy of colossal scale. This figure is the product of the fusion between the consciousnesses of all anti-spiral beings, due to which it has the power of an entire universe within itself. Especially when within its Granzeboma Mech, its strength is simply unfathomable, as it vastly exceeds thousands of universes in size alone, so anyone who doesn't exist on a similar scale would simply be nothing to the Anti-Spiral.
Rimuru Tempest can freely manipulate space-time
Anime: The time I was reincarnated as a slime
Rimuru Tempest is the protagonist of his series, and despite initially seeming rather unassuming, he is one of the most overpowered characters in anime. Although he started out as a slime, he eventually gained immense power and infinite magical abilities, with which he can create and destroy entire universes and even instantly teleport between their various points, as well as absorb all attacks that have been used against him. Due to the incredible magical powers and reality-warping abilities possessed by Rimuru, Superman simply would not be able to stand against him.
Anos Voldigoad can easily destroy Superman
Anime: The Misfit of Demon King Academy
Anos Voldigoad has destructive powers, just like many other anime characters, though the degree to which he can use his is perhaps the greatest of them all. Essentially, Ano's Eyes of Destruction allows him to destroy anything he wants, whether it's physical or even conceptual, like destroying the distance between things. With this and his sword Venuzdonoa, which can destroy all reason, everything thrown at this character is simply erased without a trace, making even Superman nothing more than fodder.
All of these series can be streamed on Crunchyroll.