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  • Alternate Self Shipping: While not as prominent as it was in the Project DIVA series' fanbase due to the existence of the original characters who the Virtual Singers are often shipped with (if not each other) and the lack of physical diversity between the Virtual Singers outside of Miku, especially when compared to the varying appearances of the Project DIVA modules, some selfcest shipping does exist in the fanbase, usually occurring between the Miku's and, more recently, the KAITO's.
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  • Americans Hate Tingle. Downplayed with Tsukasa, who ended up bearing the brunt of western fans' anger toward the preferential treatment Wonderlands x Showtime had received during the first half of the first year, nearly seating him Creator's Pet status. This has calmed down since Tsukasa had begun to show up less, with hate toward him being virtually non-existent by the time he got his first unit event banner "Wonder Magical Showtime".
  • And You Thought It Would Fail: The game initially had detractors complaining about the inclusion of male characters, instead preferring an all-female cast like with Craft Egg's other mobile game. However, the game was a success upon release, with Wonderlands x Showtime and Vivid Bad Squad being among the most popular units. Len and KAITO have also been well-received by the players.
  • Author's Saving Throw: The Project Diva games dwindled in popularity to the point that Megamix was supposed to be the last game in the series. Project Sekai revitalized interest in Hatsune Miku games by introducing a likable cast of characters, adding in new songs from the more 'modern' era of Vocaloid as well as having variety.
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    • When the game was first announced, quite a few Vocaloid fans were turned off by the inclusion of the original characters, feeling they took spotlight away from the Vocaloid cast and labelling the game as a BanG Dream! Expy with Vocaloid as flavoring. However, once the game came out, the characters' storylines and the genuine attention to the experiences of being a Vocaloid fan (especially with characters like Ichika or 25-ji Nightcord de.) as well as the differing roles the Virtual Singers themselves played won some of the initial detractors over.
    • Initially the fanbase was disappointed that Vocal tickets for songs are hard to get aside from levelling Character Ranks. Starting from 'Period of Nocturne', a Vocal Ticket Exchange Ticket item was added to the event store.
    • The 1.6.0 Update revamped the Challenge LIVE rewards, now with a stamp progression that gives 20 crystals per day and after playing consecutively for 7 days, a choice of 100 crystals or 20 to 100 of rare materials needed to raise your cards or buy outfits.
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    • The "Secret Distance" event introduced an increase to the amount of Crystals and Live Boost items buyable from the event shop, which carried over to all future events.
    • It's speculated that Len's sudden appearance in MORE MORE JUMP!'s Stage Sekai during the event Happy Lovely Everyday! might be a result of the fandom complaints of unfair treatment born from theories that the male Virtual Singers could or would not appear in Sekai born from the feelings of female unit members. Some validity was added to this when Word of God went on to reassure the player base that Len and KAITO would appear in all Sekai in a Project Sekai FAQ released some time after the aforementioned event went live.
  • Big-Lipped Alligator Moment: MEIKOdayo and KAITOdayo, mascot characters created specifically to mirror the memetic Mikudayo. They've only appeared once in the game's life as setpieces on the game's reveal stream and have never been seen or mentioned again.
    • That is, until KAITOdayo appeared again at Miku Symphony 2021 to celebrate KAITO's 15th anniversary and Mikudayo's 10th anniversary, respectively. Project Sekai Symphony news was announced at the event as well, making it significant in that regard as well.
    • The two also appeared alongside Mikudayo and Nenerobo at 2021's Project Sekai fes to celebrate the games first anniversary.
  • Broken Base:
    • The event pacing of the game invited debates on it. For context, events are released near-constantly, with typically less than four days between the end of an event and the start of a new one. Some are ok with the events rate release as it gives more content for characters, but there are people who thinks the breakneck event schedule is too much for themnote .
    • In spite of the games success, there has been quite a bit of pushback from Virtual Singer/Vocaloid fans who disagree with the treatment of the Crypton characters due to their lack of focus in the game compared to the Original Generation. As it currently stands, their roles are primarily to support the Sekai characters, and as such, this is heavily reflected in their dialogue, motivations, commissioned or cover songs, and their often minor event appearances. As well, as of the games first year there hasn't been an event that focused on the Virtual Singers alone, as every event is centered on the struggles of the Sekai characters with a chance of Virtual Singer shenanigans that involve the original characters in some way occurring in the background. Some players argue that this is normal, as game was never meant to be about the Virtual Singers and is instead a love letter to fans of the famous characters, though others argue back that this ignores the way advertising put it, as they were made the main draw of the game only to be shafted when it came to their relevance to the game.
    • Whether the creators have shown preferential treatment toward certain units, scenarios, attributes or characters has been vehemently debated since the early days of the games launch, to the point where it launched a "Balance" meme that is used in various situations to describes scenarios that either places a character "balance"-wise in an unfavorable position, such as being given too many cards of the same attribute, which makes them less useful in events that require a specific attribute they have less cards in or none of, or causes them to be shafted in a way that benefits a character that has apparently received more attention than them from the developers. The fact that developers had addressed this apparent issue in an early interview hasn't helped matters, as claims that they are still biased persist.
    • In the West, the topic of Mizuki's gender continues to generate massive amounts of controversy, with many fans having their own interpretations due to the game's deliberate ambiguity. It's so bad that the game's fan-created English wiki had to lock editing on their character page to avoid edit wars. COLORFUL STAGE deciding to Take the Third Option with pronoun usage regarding Mizuki, as in the characters using pronouns that allude to how they interpret Mizuki's gender, has garnered a mixed reaction as well, with some criticizing this move and claiming it would simply be easier to use "They/Them" as it offers the same sense of ambiguity that's present in the Japanese version of the game. Others argue in return that using "They/Them" would imply to more extreme fans that Mizuki is nonbinary, thusly adding fuel to their campaign to enforce gender-neutral pronoun usage for Mizuki in the fanbase rather than leaving it up in the air for everyone to interpret freely.
  • Base-Breaking Character:
    • Ena. While a good chunk of fans like her for her relatability to the digital art community and realistic struggle with her own self-worth in regards to her art, there's also a good chunk that dislike her due to her reaction to Mafuyu's depression in the main story, viewing her as selfish and unsympathetic towards her struggles and seemingly only wanting Mafuyu around to make herself feel better through her lyrics. This gets lessened a bit after the "Unsatisfied Pale Color" event, however, where Ena gets more Character Development and has more positive interactions with her.
    • Wonderlands x Showtime as a group is starting to suffer from this. While they are generally popular, especially Tsukasa and Rui, other fans started to feel that the devs had a favoritism and bias with the group as they have much more events than everyone else (Be it as a group or individually), especially since MEIKO got a Wonderland 4* before her Vivid Bad Squad version even gets a 4*. There's also the fact that their character quirks are superficially similar to Hello Happy World from BanG Dream! Girls Band Party! and Tsukasa being involved in many events. Unit story wise, some argued that unlike Hello Happy World, Wonderlands x Showtime's unit stories had a more realistic nuance in contrast to Hello Happy World's and what traits the group once had that are similar to the Hello Happy World members soon shed off as the story continues.
    • Since the games first anniversary event, Nene has landed herself here due to management supposedly giving her preferential treatment over the other members of her unit such as in event stories note , card rarity distribution note , and even the recent Nissin Ramen collaboration where management was criticized because of her supposedly not fitting the collaborations theme. note  Some detractors have begun to derogatorily refer to her as "Princess Nene" or "Nene-hime" due to management allegedly treating her like a princess. Unlike the examples listed under Memetic Mutation, this is regarded rather seriously by some of the fanbase.
  • Complacent Gaming Syndrome:
    • Before the first event started, Ready Steady was the most picked song in Multi-lives, due to it being the shortest song at the timenote , although shorter songs have been introduced since then.
    • In a case of Gone Horribly Right, the developers tried to defy this for the first event by scaling event point gain with the song's length, so as to prevent players from constantly picking Ready Steady. It worked too well — players overwhelmingly picked the longest song note  instead, due to it earning the most points per energy consumed, and its surprisingly easy fever chance section even on Master difficulty, second only to that for Tell Your World. Naturally, quite a few memes about it have spawned.
    • Starting from the second event, with the point gain for Melt nerfed and that for shorter songs buffed, those aiming for the top ranking spots switched to Viva Happynote , due to it having more gold notes at the skill proc sections that earn more points than normal notes, making it a faster point earner than Ready Steady. Said top rankers have since switched to the even shorter Hitorinbo Envy note  once it came out, and for Expert difficulty in particular, which is the highest scoring chart for Multi-lives in the game, scoring higher than even the Master difficulty chart due to its particularly stacked fever section. It hasn't stopped anyone else from continuing to pick Melt, though.
    • During a Cheerful Carnival event, expect players to overwhelmingly pick the left option when picking teams, regardless of what names both teams have. It got so bad during the first iteration that the game had to actively prevent players from picking Odango over Sakuramochi. And starting from the third iteration, it is because of this that top rankers end up picking the right option instead to get faster match-ups against the opposing team, resulting in the team on the right winning more points due to having stronger teams. This would later turn into an I Know You Know I Know situation where a number of people who would pick the left option would delay their choice, causing the right option to be picked more often initially and influencing at least some top rankers to pick the left option instead, before picking the left option themselves, causing the left option to start winning some events again.
  • Continuity Lockout: The Evilious collaboration. Beyond just the songs, the story of each character featured in the collaboration is fairly expansive and interconnected in various ways. However, due to te collaboration lacking an event and condensing the characters stories into brief side stories and area conversations, it leaves most players who aren't familiar with the series in the dark on who they are, their connection to the Virtual Singers, their overall motives, among other things.
  • Difficulty Spike:
    • The first two thirds of the Master chart for Hatsune Miku no Shoushitsu is closer to a level 32 or even 31, rather than the 33 the chart is rated as. The difficulty mainly comes from the final third of the chart, specifically the infamous Motor Mouth vocal spam part which increases in difficulty as it progresses, culminating in what is probably the hardest section in the entire game, and causing most players to rate it as the hardest of all the 33s.
    • Generally speaking, there is an almost-unreasonable jump in chart difficulty from Level 31 to Level 32. Even worse with Level 33, which is explicitly designed to be Nintendo Hard Up to Eleven.
  • Ensemble Dark Horse: Several side characters appearing in the respective playable group's unit story (With the lone exception of 25-Ji as 25-Ji centric stories had yet to feature a side character of the group's age) had gain much attention from fans and grew popular, in part due to their design and personality. Shining examples include Iori from Leo/Need's event stories, Sakurako Seiryuuin from Wonderlands x Showtime focused events, and Arata who first appeared in the Vivid Bad Squad focused event, Stray Bad Dogs.
    • Of the non-Miku Virtual Singers, KAITO has once again endeared himself to fans of Virtual Singers and fans of the game alone alike. It’s thanks heavily to his varying yet fun personalities across Sekai, with Vivid BAD SQUAD’s characterization of being the one who initially sparked more interest in KAITO overall.
    • 25-ji Miku has become one of the most beloved iterations of Miku from the game for her cool and dark design and innocent, kind personality.
  • Evil Is Sexy: From the Evilious collaboration, all of the featured characters (save for Len/Allen) received this reaction, though the one who received the biggest reaction of all was Gallerian Marlon, a character portrayed by KAITO in the Story of Evil. After the preview of the gacha cards was posted, KAITO trended the highest on Twitter of the revealed cards at over 30 thousand tweets with most of them lusting over his crazed appearance in his trained art.
  • Fan Discontinuity: English fans have largely avoided using the official English name for the game, Hatsune Miku: COLORFUL STAGE!, as it strips out the entire original title used in every other regional version of the game, and continue to refer to it as Project SEKAI.
    • Wandahoi being officially translated as "Wonderhoy"note  was received negatively by long time players of the Japanese version of the game, to the point where some fans refuse to acknowledge that the translation exists.
  • Fandom Rivalry: Ironically, in the Japanese side of the fandom there is a bit of heat between some Vocaloid fans and Project Sekai players due to some fans from both groups not being able to agree on whether the treament of the Virtual Singers compared to the Original Generation is fair.
  • Fan-Preferred Couple: While there are no official pairings in the game as of the games first anniversary, the game seems to push Rui and Tsukasa more toward Nene and Emu, respectively, in terms of shipping. That hasn't stopped players from making Rui/Tsukasa just as popular if not more so than Rui/Nene and Tsukasa/Emu as a ship.
  • Friendly Fandoms:
  • Foe Yay: There a small but dedicated subset of fans that ship Akito with his rival Arata Tono.
  • Germans Love David Hasselhoff: Likely due to the games association with both the BanG Dream! Girls Band Party! and Vocaloid franchises, it amassed quite a big following outside of Japan long before the game got an English release.
    • While not as popular as in the games home country, the groups Leo/need and MORE MORE JUMP! as well as their membersnote  have been met with warm reception by overseas fans.
    • The game has a surprisingly prominent fanbase in Korean who contribute a good amount of fan content to the game.
    • Among the Virtual Singers unit, MEIKO is the least popular with players in the Japan. However, western players have taken a shine to her, especially those who liked MEIKO as a Vocaloid in the first place. Luka is similarly in this position, though to a much lesser degree.
    • While by no means unpopular, as their events generally do pretty well revenue and event border wise, Vivid BAD SQUAD as a unit often falls behind 25-ji, Nightcord de. and Tsukasa or Rui focused Wonderlands x Showtime banners for full unit events, in game at least. note  Overseas, however, in some circles the unit trumps 25-ji, Nightcord de. and Wonderlands x Showtime in terms of popularity.
  • Growing the Beard: Vocaloid tuning isn't easy, especially when working with a software that technically isn't final. This is especially evident with some of the game's early songs, where the tuning has a tendency to sound "off" or "plain" all things depending, but later release songs do a somewhat better job of making the vocals sound clear and resemble human vocal patterns while maintaining its distinctly machine-like qualities.
  • Ho Yay: Akito and Touya supply the bulk of this for the male characters, in part because of the few male characters in the cast, and also because of their incredibly close bond which is meant to mirror An and Kohane's very blatant Pseudo-Romantic Friendship. For one big example, their temporary unit disbandment in the main story, as well as their rekindling of their relationship several chapters later, almost reads like a couple breaking up and making up after realizing that they truly want to be together. It only adds to it that Akito becomes grouchy, sad and despondent after Touya breaks off their partnership, focusing more on the fact that he thought Touya didn't want to sing by his side anymore more so than Touya saying their music meant nothing to him. And that's not even the half of the Ho Yay their dynamic has to offer. This official 1-koma does a great job of showing off their dynamics.
  • Incest Yay Shipping: On the Japanese side of the fandom, Akito/Ena is almost a common ship for the two outside of their respective units despite the characters being brother and sister, even overshadowing Akito/An as a heterosexual pairing in some areas. It's most likely due to the two not looking like siblings at all, as well as the fact that, to some people, their dynamic comes off as Belligerent Sexual Tension.
  • It's the Same, So It Sucks: Some people have been turned off by some of the striking similarities to BanG Dream! Girls Band Party! in terms of characters, with Leo/need and Wonderlands x Showtime being the worst offenders (being compared to Afterglow and Hello, Happy World! respectively).
  • It Was His Sled: 25-ji Nightcord de.'s story tries to play up the mystery of the identity of "that girl" that Miku wants Kanade to help save, although a good chunk of the fandom and promo material makes it well-known that said girl is Mafuyu.
  • Junk Rare: Starting from Haruka's 2021 Birthday Gacha, birthday cards have been introduced and will only be available to roll for at the time of the celebrated characters birthday, making them one of the rarest kinds of cards. Despite this, there isn't much to gain out of rolling for them. Even though they're valued above 3★, they are still far worse than most 4★ and have a debatably useless healing + perfect scorer skill that can easily be swapped out for more powerful 4★ Gacha cards. Despite this, they are present in their Gacha at the same rate as 4★ cards. Master Ranking birthday cards can be expensive, too, as they require 1000 emotion fragments to Master Rank, being higher than 3★ at 50 and lower than 4★ at 2000. You also cannot use chords to Master Rank them, since they are not 4★ cards. Also, while the characters are depicted wearing new outfits with their cards, the cards themselves do not come with new outfits. Even unlocking the card stories have debatable usefulness, as the second card story gives emotion fragments rather than crystals like every other type of card. The cards seem to exist solely as a new way to enhance revenue and don't really serve any other purpose to the average player unless they're short on 4★ cards, are collecting cards or really like the character or their art.
  • Launcher of a Thousand Ships: In spite of his attitude in game, or possibly because of it, Akito gets shipped around with other characters in the cast fairly often. Though his most prominent ship is with Touya, he's also gotten fan art shipping him with Ena, her childhood friend Airi, Tsukasa. Rui, his rival Arata Tono, and of course his fellow teammates An and Kohane.
  • Les Yay:
    • Due to being a game with an Improbably Female Cast, this was inevitable. The female Virtual Singers get in on it as well such as Rin/Miku and more recently Luka/MEIKO.
    • The now-iconic "Ne, watashi to ikitekureru?" line in "Romeo and Cinderella", in which Airi and Shizuku share an exceedingly intimate gesture with each other (while Miku humorously steps aside). And thanks to the magic of video games, you can put any pairing you want in there!
    • The most prominent Les Yay pairing in the game is An/Kohane. A prominent part of An and Kohane's relationship is the Pseudo-Romantic Friendship aspect of it, in which they're always openly affectionate with each other. This dynamic culminates to the Vivid BAD SQUAD-MORE MORE JUMP! mixed event Buddy Funny Spend Time where An and Kohane go on a double date with Minori and Haruka. The outing is explicitly described as a date, which An tells Akito and Touya as well as her father about. To her disappointment, they all know it's with Kohane without her telling them and they aren't surprised about it.
  • Memetic Loser: Minori. Aside from her very low popularity (she's consistently in the bottom two in polls alongside Honami, and her mechandise was the last to sell out during the Lawson collaboration), much of the fanbase have also noticed how often she gets put down in-game (most notably her March 2021 event and her April Fool's lines), and to that end some of them have even followed the game in "bullying" her.
  • Memetic Mutation:
    • MERUTO TOKETE SHIMAISOUnote 
      • No more Melt please/Stop picking Melt note 
    • Mizuki is Mizuki note 
    • Ena is blind. note 
    • Golden Orb. note 
    • Panels from the official Yonkoma are frequently recycled as exploitable reaction meme templates by changing the text.
    • Referring to Vivid BAD SQUAD as Vivid GAY SQUAD in the west is a fairly common occurrence in the west due to the amount of Ship Tease between the two same-sex pairs within the unit.
    • Balance / Baransu has become a fairly common thing to say on Project Sekai's unofficial international Discord, used sarcastically to describe how unbalanced certain aspects of the game and things officially related to it are such as the games attribute distribution across events, card rarity distribution, and even character art on the official Twitter.
    • Project Sekai: Colorful Stage! ft. MEIKO and/or or Luka note  Kagamine Rin has also been added onto this trend post the announcement that she would not only be the face of the Evillious collaboration, but also that two of the three songs being added for the collaboration would feature her.
      • Saying that someone at Colorful Palette must be a MEIKO-Oshi (fan) has become rather common as well, at least in the Japanese side of the fandom, due to MEIKO being the most prominent Virtual Singer in the game during the first year after Miku (not including song wise).
    • All songs are designed to be Full Combo'd with two fingers.Explanation 
  • Misaimed Fandom: Quite a number of western fans interpreted Airi Momoi as being Transgender, or more specifically Transfeminine due to her fes story having her meet her past self who wanted to grow out of the tomboy image and become more feminine in order to better fit the image of an idol who spreads cheer and hope to everyone. Airi initially resenting her younger selfs tomboyish behavior certainly hasn't helped that idea, though the story makes it clear that her issue is with being a tomboy as well as the fact that she continued to struggle as an idol despite fitting the image rather than anything concerning gender identity.
  • Moe: Kohane is an extremely popular character by sheer virtue of how ridiculously adorable she is for being associated with street music. Her singing style, while higher-pitched in contrast to the other Vivid BAD SQUAD members, manages to balance her sound with how smooth and balanced she sings, also making her very popular in songs.
    • Leo/need’s version of KAITO, which ended up partially being the reason he was so well-received by the fanbase. In the Classroom Sekai, he’s portrayed as a Shrinking Violet who speaks little and prefers to express himself through the music he plays. The other Leo/need Virtual Singers don’t hold back on bullying him over his shyness, with Luka pointing it out during his intro event causing him to blush visibly. This 4koma perfectly highlights his adorableness.
  • Rescued from the Scrappy Heap: Kotaro, Akito's composer friend initially gained the ire from fans due to his action of sabotaging An and Kohane's performance in the first Vivid Bad Squad unit story. However, when the Stray Bad Dogs event story was released, the story shows Kotaro being a loyal friend of Akito and approached the other Vivid Bad Squad members in concern of Akito pushing himself to his limits. This act of loyalty caused fans to see Kotaro in a more favorable light.
  • Ron the Death Eater: A number of people in the fanbase perceive Kohane to be a mean bully to Minori, adding to Minori's Butt-Monkey status… all because Minori wished Kohane a happy birthday and even baked her a cake, but Kohane didn't have a birthday line for Minori's birthday.
  • Scrappy Mechanic:
    • The event point gain calculation for the first event. Event point and badge gain scaled with the length of the song, causing Melt to be the most picked song due to it being the longest song. The developers had to rebalance the point gains for songs for future events.
    • The first event itself consisted only of an event shop, a ranking table and an event story, without a point ladder milestone reward like other gacha rhythm games. Subsequent events added slightly more items to be bought in the event token shop but they still lack an event point ladder milestone reward.
    • The Cheerful Carnival event format. Broken matchmaking, the imbalance of team members note , and the fact that it needs 10 players with a stable connection just to start a LIVE, made it a very unpopular event format even post-patching.
  • Sequel Difficulty Spike:
    • Compared to sister game BanG Dream! Girls Band Party!, SEKAI features more lenient and accurate hit detection for notes (especially flicks) to the point where charts in the former would be easier if ported 1:1 in SEKAI. SEKAI makes up for this by having much harder charts in general, with mechanical differences such as the Chunithum-style variable note sizes making the game more difficult, as well as boasting an entirely new difficulty tier with loads of extremely spammy and aggressive charts.
    • To put this into perspective, when "Six Trillion Years and Overnight Story" itself was actually added to Project SEKAI, its EXPERT chart was heavily based on its BanG Dream! EXPERT and SPECIAL charts as a form of Production Throwback, and it's considered one of the easiest Level 29 songs in the game!
  • Shipping: As of the games first anniversary, these ships are the most common in the fandom. While cross-over does happen, it's much more rare than these established, and seemingly supported, combinations with the exception of Rui/Tsukasa:
    • Vivid BAD SQUAD: Akito/Touya, An/Kohane are extremely popular thanks to their steadily supplied official Hoyay and Lesyay.
    • Wonderlands x Showtime: Tsukasa/Emu, Rui/Nene. As a Hoyay pairing, Rui/Tsukasa is just as popular as both pairings, if not more.
    • 25-ji, Nightcore de.: Mizuki/Ena, Mafuyu/Kanade
    • MORE MORE JUMP!: Minori/Haruka, Shizuku/Airi
  • Ship Mates: The fanbase has several per character combination:
    • Vivid BAD SQUAD: Players who ship Akito/Touya are more often than not also fans of An/Kohane. Likewise, though more rare, fans who ship Akito/An also tend to be fans of Touya/Kohane.
    • Wonderlands x Showtime: It's unlikely to find someone who ships Tsukasa/Emu or Rui/Nene and not have them ship the other prominent heterosexual pairing. Interestingly, people who ship Rui/Tsukasa don't often ship Emu/Nene.
    • 25-ji, Nightcord de.: Mafuyu/Kanade shippers tend to ship Mizuki/Ena, and vice versa for Mizuki/Ena shippers.
    • MORE MORE JUMP!: Haruka/Minori shippers tend to also ship Shizuku/Airi.
  • Ships That Pass in the Night: Although Tsukasa and Mafuyu have never interacted in the game proper, there are some fics and art shipping them together after the 'Imprisoned Marionette' and 'Run! Sports Festival!' events; it's also possibly due to the sheer difference in their personalities.
  • Stoic Woobie: Mafuyu used to be a normal girl with dreams and aspirations of her own, but years of constant pressure from her family and peers to conform to the image of a "perfect girl" that everyone saw her as caused her to finally snap and lose her sense of self, eventually losing her ability to feel and growing a nihilistic sense of emptiness and suicidial depression that manifested in the form of a Sekai. She's exceptionally good at hiding her personal issues and everyone except Emu is completely unaware that there's anything wrong with her until the other 25-ji members see her for who she is. Incidentally, her complex character attracted a lot of fan attention, and she's one of the most popular characters in the game.
  • Special Effects Failure: Clipping for 3DMV models is a problem in this game, particularly in the department of hair and clothes. For hair, Len cannot wear and is thusly rarely given hats that cover his entire head because his spikes will clip through them. As well, in certain 3DMV's, Miku's ponytails will clip through her body. This is especially evident with 25-ji Miku's hair model. Also, Leo/need Virtual Lives also experience the characters outfits clipping through their instruments.
  • That One Level:
    • Every single cosMo song:
      • The accursed duo of legendarily hard cosMo songs, "Hatsune Miku no Shoushitsu" and "Hatsune Miku no Gekishou", return with a vengeance from the Project DIVA series, being the only songs in the game rated Level 33 on MASTER and having appropriately difficult charts to match. As if to further emphasize the point, they are the only songs whose previews on YouTube are uploaded with their MASTER charts, and despite the game's substantially large playerbase, only 918 players have ever gotten an All Perfect on "Hatsune Miku no Shoushitsu" within six months of service (and even then, chances are some might've used cheat tools). To give you the idea how hard it is, witness one of those 918 players in action.
      • As if literally threatening their playerbase, the cosmo-P song "Machine Gun Poem Doll" was introduced on the 1st Anniversary WonderShow Channel with footage of the song's MASTER chart, and the cover art for the song features a mockup of the chart with a bullet hole through the player's depleting LIFE gauge. When the song was finally released at October 3 2021, the chart itself is brutal, with an Expert Chart of level 30explanation  with 1730 notes to hit for a full combo, that is just 12 notes short from "Hatsune Miku no Gekishou" on ''Master difficulty. Additionally there are no song cuts for this due to the song itself being short enough to be added to the game in its entirety, meaning you're playing the full song added onto the already difficult Expert and Master charts, making this a Harder Than Hard song. Although for the top players at least, it was actually relatively easy by level 33 standards, with the first All Perfect being achieved in just 57 minutes.
      • "Hatsune Tenchikaibyaku Shinwa" is not a 33 like the other cosMo-P songs, being only a 32 on MASTER due to lacking some aspects of its sister songs such as the long high-speed sections. This is balanced by the fact that it's the longest song in the game at a whopping 3:02 (the same length as the infamous "Melt") and has 2021 notes. The Expert chart, though, counts as the haardest 28 in the game.
    • On the "songs that aren't cosMo songs" end, there are "Hibana - Reloaded", originally a level 33 in the rehearsal edit and reduced to a 32 for the game proper, and "Brand New Day", an original song that was added to the game as part of a contest. The latter quickly garnered a reputation as one of the hardest (and fastest!) songs in the game, being one of the few charts rated 32 on MASTER due to its absolutely ballistic tempo and note density.
    • Anyone who has played Project DIVA F likely recalls the horror show that is "Negaposi*Continues", a ridiculously frenetic song with a bizarre tempo. In SEKAI, sasakure.UK strikes again with "Tondemo Wonders", a similarly-ludicrous level 32 whose chart effectively reeks of chaotic energy and has mid-song tempo shifts to keep you on your toes.
    • "Six Trillion Years and Overnight Story" by Kemu makes it's rounds in Project SEKAI, and it's pace and tempo is brutal, especially in MASTER, where you will be facing a barrage of notes at such a short time when the song reaches it's chorus. It's even worse here than it had been in the sister game, BanG Dream, as it's MASTER chart level is rated 33, and the song duration is notably longer than it's sister game counterpart in general, making this a very hard Marathon Level song.
    • The three Performai songs featured in the game break the game's rules by being officially built around using your whole hand as the intended method of completion, earning them a new, higher difficulty rating exceeding every other: 34. All of them are Nintendo Hard songs with excessively fast tempos and their own unique gimmicks to each chart.
      • cosMo strikes back with "End Mark ni Kibou to Namida wo Soete", which is the longest of the three songs by a large margin and hammers the player with every trick in the book: high-speed chains, tricks and turns, flick spam, you name it.
      • "the EmpErroR" has some of the most brutal high-speed chains in the game made to test the player's speed, stamina, and pattern recognition in a moment's notice; one wrong step and the entire thing can fall apart in an instant.
      • "Don't Fight the Music" has bar none the most outrageous hold note patterns in the game (inspired by O.N.G.E.K.I.'s gameplay), and its few chain sections are also on par with "the EmpErroR" with how fast and hard they hit you.
  • They Changed It, Now It Sucks!:
    • The forced use of NT has been a hot topic for Western fans since NT is an inherently unfinished product at the time of the game's releasenote  and fans already noticing problems with the software that weren't present with its VOCALOID predecessor.
      • While Miku NT herself generally sounds "fine", she suffers from the issue of sounding the same in almost every song she covers. Fans wonder if the tuners are even attempting to use variations like Sweet/Dark or if it's an issue with the NT software not really distinguishing much between the different voice bank styles compared to VOCALOID. This issue is more obvious in more recent songs where the original producer used "unique" tuning which is lost in the transition to the SEKAI Versions since as far as anyone's aware all NT tuning is done in-house by the developers.
      • Criticisms for KAITO, Len and Rin have been on the lighter side due to being better received by fans, with some saying that Rin and Len NT barely sound any different from their V 4 X voicebanks. Meanwhile, MEIKO and Luka have received harsher criticisms than even Miku NT, though MEIKO as of recently has been deemed the worse one of the two, since Luka, at least in the newer songs, has the flaws in her NT voicebank hidden by higher pitches. Even so, fans are disappointed in her NT voicebanks lack of the mature, huskier tone that made her so popular back then. MEIKO, on the other hand, is said to sound bad in general, leading to claims that they're trying to make her sound like a completely different voicebank. In the Leo/needs commissioned song "Pulse of the Meteor", MEIKO's tuning has been criticized, with some saying that she sounded more like Miku than herself during her solo lines.
    • Speaking of which, "Patchwork Staccato"'s SEKAI Ver. is considered one of the weaker covers, as while the singers do well enough, the song is changed significantly to accommodate the vocal ranges of Airi and Shizuku, which some feel detracts from the emotional effect that the original had.
    • The Sekai cuts of most songs (Melt being a notable exception) are different from those in other games that said songs appear in, such as the main Project Diva series, and the changes have often not been very well received. In particular, the Hitorinbo Envy cut has been widely panned due to how much of the song it cut. Not that this bothers the top rankers much. "Cendrillion" also received a similar reaction, though the extremely long intro that takes up a majority of the songs time serves to justify the cut in a way.
    • In an attempt to combat the visual bug where Super Fever would sometimes be displayed as normal Fever, some songs had their Fever Chance sections extended, others moved earlier, and in particular, some of Hitorinbo Envy's skill activation sections were also moved earlier. All these were seen as nerfs to the affected charts (especially for Envy) which were naturally not well received.
    • A number of new changes and nerfs announced during the games first anniversary live stream were met with negative reception, such as Birthday and Special Lives having crystals replaced with Vocal tickets, Gacha cards giving a higher boost than event and already obtained cards (Up to 70% versus 25% for everything else), the cards Master Rank adding to the boost, the amount of points obtained during multi-live being additive instead of multiplicative like they were originally, changing the mission pass to include items the player could obtain during the weekly events and less crystals as a result, making the "Value Set" cost paid crystals instead of real moneynote  only for the rolls the player gets in return of buying the "Value Set" turning into a roll ticket note . To a number of players, these changes seem unnecessary at best or money grubbing at worst, since nearly all of them point the player in the direction of spending money on the game. note  The fact that these changes were announced along with another upcoming paid piece of content called Connect Live, a special type of Virtual Live that is supposed to feel more like an actual concert experience than Virtual Live, and with the announcement that the anniversary costumes are paid gacha bonuses only furthered the accusations that Colorful Palette wants to gradually shift the game to favor people who spend money in the game.
    • The SEKAI Ver. of "The Lost One's Weeping" made the odd decision to change the singing pitch for the chorus, where instead of being a mid-range it's now Ichika and Rin singing high and Shiho singing low, which made a few fans complain that it arguably sounds worse than any of the other versions.
    • While most of the other group logos were generally well received, the English counterpart to Nightcord's group logo was perceived as being weird and amateurish compared to the highly-stylized Japanese logo, with many fans complaining that it looks very similar to the oft-derided Comic Sans font.
  • Unexpected Character:
    • The reveal of non-Crypton Vocaloid songs being on the table for song picks (starting with "Charles" and "Fragile", sung by flower and GUMI respectively) surprised many fans, as in DIVA this was never able to happen since the series was only about the Crypton Vocaloids and in mirai it was only GUMI songs where she sang with a Crypton character. This change opened up a huge department of picks that fans considered previously impossible, with future song releases including songs from IA and even VY2V3 (for "Totemo Itai Itagaritai").
    • Due to event story's only introducing the male Virtual Singers in the Co-ed groups Wonderlands x Showtime and Vivid Bad Squad, many players believe that the female only groups wouldn't have Len and/or Kaito appear at all in their corresponding SEKAI's. When the More More Jump focused event, "Happy Lovely Everyday!" was released in August 2021, More More Jump Len was included in the list of focus characters to appear, surprising the players.
  • Unpopular Popular Character: While not widely disliked as a character in-universe, as a singer Akito Shinonome is regarded as being the weakest of the group, who has fallen behind everyone else in Vivid BAD SQUAD as of Bout for Beside You. This view was initially implied by non-playable characters like Arata but later reinforced by Mafuyu and Mizuki when discussing the vocal performance of each Vivid BAD SQUAD performer individually. However, out of the games story, Akito is one of the games most popular singers, being one of the main reasons why Vivid BAD SQUAD had become so popular musically within the fanbase.
    • Vivid BAD SQUAD's incarnation of KAITO. He's the Virtual Singer groups resident Butt-Monkey who doesn't get much respect from his pupils Len and Rin, who Akito has openly expressed his dislike toward, and who MEIKO is often exasperated with due to his childish, carefree nature. The only ones who seem to tolerate his behavior are Miku, Kohane, and Touya. Despite this, he's fairly popular with the fanbase who liken his traits to old, popular fan depictions of KAITO.
  • Vanilla Protagonist: Leo/need has been accused of being this by some fans due to the group being less "colorful" compared to the games other units.
  • Viewer Gender Confusion: Invoked deliberately with Mizuki, whose gender identity was called into question upon their profile reveal. The reaction to the canon invoked Viewer Gender Confusion of Mizuki spawned some theories that vary depending on the side of fanbase. In the western fanbase, fans debate whether they’re a cross-dresser, Transgender or non-binary. In the eastern fanbases, Mizuki being an Otokonoko is the most common theory.
  • What Do You Mean, It's for Kids?: While Project Sekai is rated 4+ in the AppStore, it hasn't shied away from including adult-ish content in the game. Outside of the songs with themes of death, suicide, and depression, there are a growing number of songs with sexual themes such as Romeo and Cinderella, Gimme x Gimme, On the Rocks and most infamously, Pomp and Circumstance which is a song that's explicitly about women singing about their sexual encounters. The song received a gender-flipped cover by Vivid BAD SQUAD's subunit BAD DOGS featuring KAITO, despite them being high school 1st year students. This isn't even getting into the fact that the plot covers some pretty family-unfriendly topics for its age rating, including bullying, depression, and abuse.
  • Win Back the Crowd: For some players, several aspects of the Vivid BAD SQUAD storyline are considered some of the weakest writing in the game due to the stories clunky Shounen format that cannot be conveyed properly in the games Visual Novel format, some players being unable to sympathize with their goal to surpass RAD WEEKEND due to the players being mainly left in the dark about what the whole event entails, as well as the characters' primary focus on their partnerships rather than acting as a team. While the event stories "Period of Nocturne" and "Stray Bad Dog" were received warmly for either breaking the formula or expanding on the goal, other unit event stories from the group such as "Someday, with our Back-to-Back Lyrics", "Awakening Beat", and more recently "Bout for Beside You" have been criticized for their repetition and sloppy writing, particularly in "Bout for Beside You". It wasn't until "Same Dreams, Same Colors" that the story was considered up to par again, as it simultaneously acts as a Breather Episode for the group which tones down the "surpassing RAD WEEKEND" aspect of their storyline while also allowing the characters to have more prominent cross-partnership interactions, such as between An and Touya who are often criticized for their relationship essentially boiling down to "friend-of-a-friends" despite having been part of the same team for several events. Also, while they still do stick to their established partnerships and remind the players of their importance as partners, there is a group bonding aspect to the event, which was received warmly by the players who want them to become more of a team.
  • Woolseyism: "Kuyamu to Kaite Mirai" is bizarrely translated to "Composing the Future" in COLORFUL STAGE!, which is a vaguely loose translation of the title at best but does manage to convey the song's relevance to the Nightcord story arc in a more concise manner.
    • While the decision received a mixed reactions from the western fanbase, the COLORFUL STAGE decision to have the cast use pronouns based on how they perceive Mizuki is the most realistic route they could have taken rather than having the characters use gender-neutral pronouns by default. This is because a majority of the cast is just as in the dark about Mizuki as the audience is, save for the few characters that know about Mizuki's past and are implied to know about their secret.note  As such, It wouldn't make sense for someone like Ena, who is unaware of Mizuki's past and who Mizuki fears learning their secret, to refer to them gender-neutrally.
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