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The world of anime today is dominated by shonen titles such as Demon Slayer, Chainsaw Man, and Jujutsu Kaisen. These shows are celebrated for their stunning animation and innovative storytelling. However, every genre has its roots, and for shonen, the path to international success was paved by earlier series that, unfortunately, have not all stood the test of time. Despite their pioneering role, many foundational series now appear antiquated, marred by dated animation techniques and static character arcs. Additionally, issues such as excessive fan service and the unsettling sexualization of minors, which were woven into these narratives, cast a shadow over their legacy.
For those who grew up watching these shows, revisiting them as adults can be a jarring experience. Scenes that once seemed innocuous may now provoke discomfort when viewed through a more mature lens. While nostalgia can soften the edges of certain elements, like the exaggerated fan service and harem tropes, it cannot excuse all the problematic aspects that were once overlooked or tolerated as products of their time.
The Seven Deadly Sins serves as a quintessential example of this dichotomy within shonen anime. Despite its popularity, the series is not without its flaws, including an abundance of filler episodes and animation that shows its age. Yet, the most troubling issue lies in its use of rampant fan service and the inappropriate portrayal of minors. The character of Elizabeth, who is central to the plot and Meliodas’ affection, is only 16 years old. Her role, unfortunately, often devolves into a tool for comedic sexualization and merely supports the development of Meliodas, reflecting a troubling characteristic of female love interests in many shonen narratives.
The Seven Deadly Sins Takes the Fan Service Over the Edge
The Seven Deadly Sins is the emblematic shonen series. It’s certainly beloved, but it also has its fair share of issues, like extensive filler and dated animation, but its most glaring issue is the rampant fan service and sexualization of minors. Meliodas’ love interest, Elizabeth, is canonically 16 years old, and a hallmark of shonen female love interests, existing primarily as a channel for comedic sexualization and a sounding board for Meliodas’ development.
Melodias gropes, exposes, or somehow sexually harasses Elizabeth in nearly every episode as a running gag. While loosely humorous in 2015, those scenes now just serve to derail the plot and exist largely for cheap laughs. Even for fans invested in the story arcs and Melodias’ growth, it’s tough to sit through all of the tired tropes.
Fairy Tail Repeats Its Formula Until It Means Nothing
Fairy Tail has simply aged poorly. Its repetitive arcs and consequence-free fights make much of the conflict feel hollow. The “power of friendship” theme, a staple of shonen, is used so often that it starts to feel like a shortcut rather than an emotional payoff, especially when nearly every major battle hinges on it. Add in uneven animation and the expected fan service involving teenage or minor-presenting characters, and the series begins to feel stuck in its era.
A lot of Fairy Tail’s staying power comes from nostalgia. It isn’t terrible, but it often lands as just okay. The low-stakes fights and dated fan service undercut its real strengths in world-building and guild camaraderie. For newer viewers, it’s hard to ignore how many later series have simply done it better.
Sword Art Online Popularized The Worst Isekai Tropes
To give credit where it’s due, Sword Art Online helped popularize the isekai boom and inspired many of the genre’s biggest hits. Though its premise is creative and engaging, many aspects of SAO fall flat after the first season. As a protagonist, Kirito is the standard catch-all isekai power fantasy male lead, meaning he doesn’t have a personality and his harem feels illogical. What little character development he had in the first season all but disappears in the second.
The other issues with Sword Art Online Season 2 only compound that decline. Kirito’s expanding harem continues into an unnecessary incest-leaning subplot with his cousin Suguha, and the series’ best character, Asuna loses much of the agency that once made her compelling, and is reduced to a damsel role, with a notably graphic and distasteful assault scene. While SAO played an important part in developing the isekai genre, it no longer warrants a watch.
Food Wars Undercuts a Great Concept With Distasteful Fan Service
Food Wars is, at its core, a genuinely good show. The premise is unique, the culinary creativity is impressive, and the animation was far ahead of its time. The issue is the fan service. While not unusual for its era, Food Wars leans into fan service so heavily and with such detail that it borders on softcore pornography. It consumes significant screen time, often centers on underage female characters, and rarely adds to the actual plot.
Though the extreme nature of the fan service significantly contributed to Food Wars’ notoriety, the story stands perfectly well without it. The well-developed supporting cast, loveable protagonist, and attention to detail in each dish render it a standout shonen series well deserving of praise. Unfortunately, it’s best enjoyed with headphones and behind closed doors.
The Future Diary Collapses Under Its Own Twists
The Future Diary is a decent watch, as long as viewers don’t think too hard about it. When it debuted in 2011, its battle royale premise, built around diary-based future predictions, felt fresh, and the animation and violence helped it stand out in the thriller space. But that novelty wears thin across 26 episodes filled with plot holes, uneven pacing, and twists that don’t hold up under scrutiny.
Yuki, positioned as The Future Diary‘s reluctant everyman protagonist, quickly becomes frustrating. If the goal was to write him as an indecisive, self-pitying doormat, it succeeds. He’s hard to even root for. Combined with the series’ messy execution, the only real draw is Yuno, whose yandere absurdity carries much of the show’s entertainment value. Beyond her, The Future Diary is a guilty pleasure at best.
Black Butler Leans Too Heavily Into Suggestive Framing
Black Butler is an early 2000s shonen staple that probably wouldn’t survive a modern premiere without serious backlash. There’s much to love about the series — the gothic Victorian aesthetic is striking, the writing is strong, and the mystery and horror elements are engaging without relying on cheap shock value. Black Butler’s glaring issue is the way Ciel and Sebastian’s relationship is visually framed.
Ciel and Sebastian’s demonic contract isn’t itself problematic or even uncommon for the genre, but the anime leans into certain textbook shonen visuals that bait romance, like extended skinship and bridal-style carrying. It’s deeply unsettling to watch, given that Ciel is 12 years old, and Sebastian is unmistakably presented as an adult. Canonically, there is no romance between the two, so the visuals only serve to be uncomfortable distractions from what’s otherwise an incredible anime.
Rent-A-Girlfriend Drags Out a Story That Goes Nowhere
Rent-A-Girlfriend is one of those series that somehow keeps getting renewed despite rarely being called “good.” It doesn’t have the loud, defensive fanbase of other controversial anime, largely because it’s hard to argue that it’s anything more than mediocre. In many ways, it’s the reality television of harem shonen romance.
The premise follows a painfully average protagonist who stumbles into an undeserved harem of attractive, capable women and then spends dozens of episodes spinning his wheels. Kazuya is intentionally written as relatable, but after multiple seasons, there’s little meaningful growth or romantic progression. The plot moves in circles, leaning heavily on fan service and filler. A weak protagonist can be balanced out by a strong plot execution, and excessive melodrama can be looked over with well written characters, but Rent-A-Girlfriend just underperforms on all fronts.
Hunter x Hunter’s 1999 Dub Can’t Compete With the 2011 Remake
Hunter x Hunter is obviously foundational to shonen anime, and its legacy needs no explanation. The storytelling is layered, the power system is one of the smartest in the genre, and arcs like Yorknew and Chimera Ant are still held up as benchmarks for what battle shonen can achieve. It’s a series so phenomenal it received two anime adaptations, and one is clearly superior.
The 1999 anime adaptation feels largely eclipsed by the 2011 remake. The newer version features cleaner animation, stronger pacing, and a dub that feels far more emotive and cohesive. By comparison, the 1999 dub comes across as stiff and occasionally miscast. With the 2011 adaptation widely regarded as not just the better of the two, but one of the greatest shonen series of all time, there’s little reason beyond nostalgia to revisit the earlier version.
The One Piece Filler Arcs Stretch an Already Massive Time Commitment
One Piece is a household name and fully deserving of its hype, but even longtime fans admit it’s difficult to break into. Not because the Straw Hat Pirates aren’t endlessly entertaining, but because of the sheer time commitment. Toei Animation’s adaptation began in 1999 and now spans over 1,100 episodes across more than two decades, inevitably accumulating filler along the way.
For new viewers, there are sixteen One Piece filler arcs that can be skipped without missing canon material. While some, like G-8, are fondly remembered, filler arcs are rarely the reason the series is celebrated. They aren’t unwatchable due to poor quality, but in a show this long, most viewers would rather prioritize canon episodes than spend time on stories that don’t move the narrative forward.
One Punch Man Squanders a Near-Perfect Start
One Punch Man is becoming the anime series that almost had it all. After a near-flawless debut season in 2015, anticipation was high for Season 2, and fans were let down hard. While the Garou storyline had potential, the noticeable drop in animation quality overshadowed much of the narrative, with fights lacking the weight and fluidity that defined Season 1.
If One-Punch Man Season 2 was disappointing, Season 3 has been far worse. The heavy reliance on static shots, uneven pacing, and weaker visual direction make it feel like a shadow of what it once was. One Punch Man Season 3 sits at an abysmal 4.74/10 on My Anime List, down from Season 1’s 8.48/10. For those who liked One Punch Man and want to remember it fondly, it’s best to consider Season 1 a standalone hit.