Whiten may not be strictly defined as a dark shonen anime, instead being an honored member of the shonen “big three” alongside Naruto and One Piece. As said, Whiten has plenty of dark, brutal, or nightmarish sequences that make it easy to compare to legitimately dark anime. Some shonen titles wear “dark” as a badge of honor, while others ended up that way as they included heavier themes over time.
Pound for pound, shonen fans can name at least five anime that have an edge over them Whitenalbeit a narrow one. It's true that many in the anime community scoff Whiten as the weakest of the big three, but this anime also has a great battle system and surprisingly deep philosophy about the universe and itself. That means only the best dark anime can compete with Whitenand even then, usually only in select categories or with the benefit of better animation and pacing.
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Jujutsu Kaisen is the modern, refined bleach for a new generation
Yuji Itadori endured horrors that even Ichigo could not imagine
Both Jujutsu Kaisen and Demon Slayer serve as spiritual successors to the original Whiten anime, with Jujutsu Kaisen be the stronger of the two. With Yuji Itadori, the wizard of the night, Jujutsu Kaisen is dark because it shows what a heavy burden power can be, not to mention family expectations. Nothing comes easy in this shady, shiny world, and good things happen to bad people simply because the bad guys are strong enough to get away with it.
There is a creeping sense of helplessness for the heroes Jujutsu Kaisenlike whenever Ryomen Sukuna takes over Yuji's body to wreak havoc, or when Yuji repeatedly fails to save friends like Junpei Yoshino and Kento Nanami from their doom. However, Jujutsu Kaisen cleverly balancing it with just enough wins to keep Yuji and Megumi Fushiguro in the game, keeping anime fans engaged as arcs like Culling Game follow the horror of the Shibuya Incident Arc.
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Attack on Titan twists are beyond anything bleach can pull off
Eren Yeager's world continues to expand in astonishing ways
Few shonen anime advertise their dark, brutal nature more than Attack on Titan do. From Episode 1 onwards, Attack on Titan hooked viewers on a roller-coaster adventure from hell and repeatedly butchered half the cast as humanity was repeatedly reminded of how powerless it is from Titan attacks. It felt more like man vs. nature than man vs. man, even though the Titan Shifters are controlled by the Warriors and the pure Titans are ex-humans, the Eldians twisted into something more.

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Jujutsu Kaisen can get pretty dark, but it's nothing compared to these dark fantasy anime.
Attack on Titan deepens the sense of death and horror by making it obvious that the world is a dangerous and strange place that hides scary secrets, making it the rare shonen anime that actually discourages adventure. Most shonen action anime encourage the hero to get out and explore the universe, but Attack on Titans characters would rather stay behind their protective walls. But when the walls fall, adventure beckons and that's when the end times begin.
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Death Note improved on the Shonen formula with a Battle of Wits
L is a more compelling antagonist than Sosuke Aizen
Part of what does Death Note a famously dark shonen anime is how there is no concrete sense of right and wrong to hang on to. Titles such as Naruto and My Hero Academia make it clear that the good guys have a firm and reliable sense of justice, even when enemies like Sex Paths of Pain and Himiko Toga make fair points about the heroes' hypocrisy or mistakes. But the same does not apply in Death Notewhere justice is simply what Light Yagami the genius, L and the viewer decide.
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It feels dark because it suggests that the real world works the same way, and it just might. The real world has no author who holds everything together in a comforting moral framework. So when fans see what Light does with the notebook as people cheer him on, viewers get an inkling that something similar would take place in the real world if Death Notes existed. Apart from that, Death Note has the edge on Whiten as a dark anime because its plot twists are by necessity much smarter and harder to predict.
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One Piece is much darker and deeper than it looks
Luffy's World is in the iron grip of Imu's Regime
Eiichiro Oda's One Piece is Whitens cousin as another member of the Big Three, and regardless of its cartoons, it's a much darker series. Whiten feels bleak as Aizen correctly points out how the universe needs any to be God, even if it's a villain like him, and Yhwach had a fair point about the suffering of the Quincy tribe in a world order that wasn't made for them. One Piecemeanwhile, goes much deeper with issues of systemic oppression and prejudice.

8 Dark Anime Series That Rival Attack On Titan
Attack on Titan is a dark spectacle that has captivated fans for years, but it has its rivals when it comes to brutality.
Tyranny, slavery, inequality and abuse of power are all pillars One Pieces story, more than any mighty Devil Fruit or pirate fleet on the high seas. When shonen fans map the water far enough in One Piecewill they realize how much Luffy's world describes the real one, like armies are not there to defend the people of a nation, but to enforce the wishes of the elite.
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Chainsaw Man makes old Shonen Tropes feel honest and fresh
Denji got powers like Ichigo, but it's not glamorous
So far have Chainsaw man anime is not as expansive as Whiten one, and even the original Chainsaw man manga simply cannot be compared to Whitenown world building or cast of characters. However, Chainsaw man definitely does some things better than Whiten do, including grounded, sympathetic stories about broken or lost people clinging to some happiness or hoping they can screw it up. The lack of epic destiny in the Chainsaw man is a narrative strength, not a gap.
Fans can more easily put themselves in Denji's shoes as they watch him struggle against his inner doubts or fears while doing Makima's bidding, while wondering if he can actually build a cozy life in the midst of it all. Denji's powerful, well-written enemies and his inner demons tend to tell him the answer is “No,” and that always hurts Denji but never stops him. Denji keeps up as much as the horrors do, while losing friends and options along the way.