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     A - C 
  • Abandon Shipping:
    • The Toffee/Queen Butterfly ship was very popular in early Season 2 due to the likability of both of those characters, but it lost fans due to theories they were related, and was later totally erased due to the revelation that Toffee killed Moon's mother and when he coldly attempts to kill Star in front of Moon with no sign of remorse.
    • The popular Starco ship saw some desertion through the time. Large losses in shippers happened when "Bon Bon The Birthday Clown" started hinting that the Blood Moon cursed them into being together, which was later confirmed, and "Running With Scissors" where due to spending some time in Hekapoo's dimension and being in a different time, Marco was technically well into his thirties (which the creators dismissed, but some fans did not). Others quit through Seasons 3 and 4, which saw many deserting the ship to go for other new options such as Kelly/Marco, Tom/Star and the less teased ones such as Tom/Marco, and some quit because they were simply just tired of their Will They or Won't They?, which they considered the weakest part of the show's writing and often made Star and Marco come off as unsympathetic or forcefully pushed into a relationship by the story.
    • Hekapoo/Marco lost many fans in Season 3, where "Night Life" shows them separating from each other on bad terms, though later episodes such as "Divide", "Conquer", and "Gone Baby Gone" show they are still friends. Hekapoo's following treacherous acts as part of the Magic High Comission and her particularly racist actions towards Eclipsa made her loose even more fans.
  • Accidental Aesop: Doubling with Family-Unfriendly Aesop, the love triangles lovers  give off the impression that if your partner cheats on you, you should be OK with it. If their lover is someone they are far more compatible with, then you have to be the bigger person and let them be happy.
  • Alas, Poor Scrappy: Even people who didn't like Glossaryck found his temporary demise in The Battle for Mewni, as well as his permanent demise in "Cleaved", to be sad.
  • Angst Aversion:
    • A lot of fans (especially Starco shippers) found the scene in "Starcrushed" where Star confesses her feelings to Marco before she breaks down crying and retreats back to her room to be very difficult to watch.
    • Likewise, the end of "Just Friends" when Star realizes she's Alone Among the Couples and leaves knowing that Marco only sees her as a friend is just as painful.
  • Angst? What Angst?:
    • Jackie-Lynn Thomas quickly got over Star having feelings for Marco. She even broke up with him when she realized she can't come between the two.
    • Janna isn't traumatized by the death of Quirky Guy and Star doesn't feel any guilt for destroying the source of magic, which inevitably kills all beings composed of magic.
  • Anti-Climax Boss:
    • At the end of The Battle for Mewni, after Toffee had been threatening and draining the magic of the multiverse for an entire season, this happens to him. Instead of an epic battle of any sort, Star simply performs the Whispering Spell again, enters the wand, and grabs a remaining piece of untainted magic. This activates her Golden Super Mode, she attacks him with one powerful blast, and Ludo knocks a tower onto what remains of him.
    • Meteora in the Season 3 finale is not one to Star, but once Eclipsa enters the fray, she becomes one as she is easily curb-stomped by her mother.
    • Mina, during the Grand Finale, gets taken care of rather easily without a fight. She finds the Realm of Magic, jumps in, gets drowned by the big corrupted millhorse, and loses all her power once the deed is complete. In fact, the Final Boss of the show ends up being the (only vaguely explained) corrupted millhorses, and even they aren't super climatic for the series Grand Finale.
      • How some felt about Mina being the last antagonist of the series. It's hard to take her seriously as a threat when all her scenes were played for laughs or pathetic or as seen in her flashback to her original self, pitiful. Especially as there much more suitable threatening enemies such as fan favorite Toffee who never accepted humans, Monster Arm (who swear to return) or never before seen terrifying monsters like Seth that could had made the final battle much more memorable especially as their only weakness was magic and could had been permanently taken out before magic was destroyed.
  • Anvilicious: The aesop about appearances can be deceiving and how history is Written by the Winners became this for many fans, with the Mewmans being the racist oppressive invaders being hammered in so much it can be irritating.
  • Arc Fatigue: A large issue regarding the show is the lengths in which the plots take up, not helped by the show taking hiatus' around Mid-Season and even in between seasons.
    • The Will They or Won't They? between Star and Marco has been considered by quite a few fans to be the weakest part of the series, and one of the complaints is how much it drags on. Their relationship problems could have been solved as early as the beginning of Season 3, with Jackie being Put on a Bus, but instead, the Love Triangle Jackie/Marco/Star is substituted for another one, the Tom/Star/Marco triangle, essentially simply re-starting the plot. A lot of people became upset with the fact that, by the time Tom and Star broke up and Tom gave Marco his blessing for him to start a relationship with Star, there were only five episodes left to wrap up their relationship and the Myth Arc of the series, when Tom and Star had almost two seasons to develop and be together as a couple, upsetting both Tom/Star and Marco/Star fans.
    • The overlying Myth Arc surrounding Eclipsa Butterfly became fraught with this. Initially introduced in Season 2, many began wondering how and when the Myth Arc would progress as casual hints were dropped. However, after the hiatus between Season's 2 and 3, combined with the amount of episodes that didn't contribute to it, the Myth Arc began to lose interest. Interest was reignited once Eclipsa herself debuted and became a member of the recurring cast, but soon began to dwindle again once she was pushed to the background in favor of the Romantic Plot Tumor. Once Monster Bash furthered it however with the reveal of her daughter Meteora Butterfly, aka Miss Heinous, interest seemed to be reignited as Season 3 revealed more and more, only to wane again as the romance took center stage over and over again. By Season 3's end, the Myth Arc shifted from Eclipsa and Meteora towards Eclipsa's husband and the Prince of Darkness, Globgor. Unfortunately however, by this point Seasonal Rot began to set in after a near year long hiatus, and by the time Globgor started having more information revealed, fans had either grown tired of waiting, or given up thinking the romance would just eclipse the Myth Arc once again.
  • Ass Pull:
    • In "Storm the Castle", a tiny Italian unicorn shows up out of nowhere to restore Star's wand. It was never foreshadowed or hinted at before it appears, and it's one of the last scenes of the episode.
    • "Spider with a Top Hat" ends with the title character, an entertainment spell of Star's that wishes to be used for combat like the others, being summoned as a last resort to fight off a powerful monster. Out of nowhere, his hat turns into a mini-gun that defeats the monster.
    • Globgor turning out to be the name of Eclipsa's monster lover seems a little too convenient especially considering Eclipsa doesn't react to the name in "Stranger Danger".
    • Moon revealing she is responsible for the Solarian Warrior Rebellion and Rhombulus freeing Globgor comes across as this given she knows Mina is crazy, and started a friendship with Eclipsa in Season 3. Her motive for doing so (she held a grudge against Eclipsa due to her interference during their fight with Meteora, leading to her going to the Realm of Magic thus separating her from her family) doesn't help either, as it makes her look very petty since it's for reasons that were entirely her own fault due to her rash actions. It also makes no sense given that "The Ghost of Butterfly Castle" had her refusing to join up with Mina when she asked for her help, referred to the Solarian Program as a "dark time" in history, and her only petty action was refusing to warn Eclipsa, declaring that Mina was not her problem since she wasn't queen anymore. This Face–Heel Turn only really happens because the story needed an army of Solarian Warriors for the finale.
  • Author's Saving Throw:
    • Two concerning "Running With Scissors":
      • The second "#MarcoLIVE Animated Live Chat" had Marco considering the sixteen years he spent chasing Hekapoo as something he remembers like a hazy dream or an old childhood memory. This gave the heavy implication that Marco was still mentally fourteen years old, which more or less Hand Waved why the effects of his time in the Neverzone weren't present in future episodes, and alleviated many shippers' concerns over whether or not it was appropriate to keep shipping Marco with anyone. When Marco's adult self does return, it's treated as if Marco is a completely different person than his teenage self.
      • Conversely, many fans were upset that Marco's time in the Neverzone and the ending's implication that he would have a rough time readjusting to Earth was seemingly dropped and Hand Waved away, with him not retaining any of his badassery from the experience, leaving many feeling They Wasted a Perfectly Good Plot. Seasons 3 and 4 not only make numerous call backs to Marco's time in the Neverzone, but make it a major aspect of his character.
    • "Heinous" was the first follow up episode to "St. Olga's School for Wayward Princesses" but was rather mundane and anti-climatic since most of it involved the Diaz parents treating Miss Heinous more like a neighbor than a villain, and not allowing any battle between her and Star and Marco. Come "Princess Turdina" where Miss Heinous returns and finally gets to have her evil colors shine, making it a more appropriate sequel episode to "St. Olga's".
    • After many fans had assumed that the writers simply brushed the events of “Starcrushed” under the rug, “Booth Buddies” finally has Marco acknowledge Star’s feelings for him. It’s stated in-universe that Marco tried to ignore the awkward tension between the two and he does realize how much things have changed between them.
    • As fans felt Marco and Jackie's breakup happened unceremoniously in Season 3, the Season 4 episode "Britta's Tacos" gives proper closure to their story.
    • As the racist attitudes of Mewmans has been expanded upon in Seasons 2 and 3, it made them come off as one dimensional bigoted jerks, but Season 4 ends up putting a more realistic spin on it. "Down by The River" has the Maizleys as the viewpoint characters as they are subject to Eclipsa's new pro-monster reforms. Their predicament of being displaced from their home is portrayed sympathetically, showing how such policies that favor an oppressed race aren't always a good thing, and the Maizleys along with everyone who used to live in the now-destroyed capital, just want to survive. It comes across strongly in the Series Finale; Most of the Mewmans who volunteered to become Solarian Warriors stopped following Mina after they were freed and were happy about it, showing that in spite of their own racism, they prefer to live life rather than let it define them.
  • Awesomeness Withdrawal:
    • The show gets this in similar regards to shows like Steven Universe and Gravity Falls. One example was the announcement of the 4 month hiatus right after the airing of The Battle For Mewni special which itself had been preceded by a 5 month hiatus that followed the Season 2 finale, "Starcrushed". Between the hiatuses, fans have started to become upset with the show's sporadic release schedule as the epic bombs and Cliffhangers that are dropped when new episodes do air just leave people all the more starved during the long hiatuses that follow.
    • The hiatus from the season 3 finale to the season 4 premiere is definitely this, with the hiatus being 11 months long.
  • Badass Decay:
    • Invoked with Buff Frog. While still capable and skilled, he can't bring himself to attack and torture after becoming a parent. Of course, he isn't an antagonist at all by this point. Zigzagged in that while he's reluctant to cause harm to others, other aspects of Buff Frog make him more badass than he was before. Unlike his time as a villain, he now uses his frog abilities to great effect (leaping great distances, using his stretchy tongue to retrieve distant objects) and even holds his own against the wand-empowered Ludo while fighting with only his fists.
    • Ludo was genuinely intimidating in the first half of Season 2, peaking when he stole the Book of Spells and very nearly killed Star. Afterward, his childish and pathetic traits resurfaced as he was revealed to be Toffee's pawn, and while he still has his moments (such as actually conquering Mewni and later being the one to finish off Toffee), it's not as consistent as before. The trade-off, however, is that he becomes a much more interesting character, revealing a sad backstory and a more sympathetic reason for why he does everything that he does.
  • Big-Lipped Alligator Moment:
    • In Season 1's episode St. Olga's Reform School for Wayward Princess', as Star and Marco are fleeing with the still brainwashed Pony Head, they come across a room with a mysterious skylight, depicting various winged beings demonic in design descending from the sky. The attention brought to the skylight implies it holds some significance to the plot, however its never brought up again once they leave.
    • While looking for Dr. Jelly Goodwell's office in "Starfari", Star comes across a small, pink talking horse riding a knight. Star just excuses herself out as quickly as possible.
    • The creepy crustacean thing living under the photo booth seat in "Booth Buddies". In an episode dealing with teenage romance drama, it's definitely out-of-place Nightmare Fuel, and it's never brought up again despite most of the episode taking place literally on its home.
    • In The Tavern at the End of the Multiverse, just as Star admits that Toffee was right in wanting to destroy magic, Moon's tapestry is shown, and the Toffee on it pulls his "Surprise!" face from Storm the Castle, serving as a Jump Scare to both Star and the viewers. Why it does this is never explained, has no build up, and isn't mentioned once Star heads back to the tavern.
  • Captain Obvious Reveal: The revelation that Toffee lives on in the wand in "The Hard Way" was a pretty obvious conclusion that many fans reached months in advance. In addition to Toffee's dissonant smirk when the wand fragmented in "Storm the Castle" (heavily implying he meant it to happen), Ludo's wand forms itself from his skeletal arm clutching a rock with the wand crystal on it, which was not the state of the fragment at the end of Season 1. This — combined with his briefly-demonstrated Healing Factor, Ludo "hearing" his wand speak to him, and the (apparent) post-mortem build-up of Toffee as a major character — made his survival through the wand very likely.
  • Catharsis Factor:
    • Star giving a "The Reason You Suck" Speech to The Magic High Council for their hypocritical stance towards everyone when they lied about Eclipsa.
    • A tiny one, but Angie and Rafael subtly calling out Star and hitting their Rage Breaking Point over Marco having left home for months, after Star had left abruptly and left Marco depressed. While it's partly their fault, they have a point that they were doing all they could to help Marco through his depression and it wasn't enough. The fact that it's Angie and Rafael, two of the nicest parents in this show, makes it a case of Beware the Nice Ones.
  • Continuity Lockout: Season 1 is relatively standalone, but with some plot-centric episodes, but once Season 2 aired, the series starts throwing out major plot twists, continuing almost every episode after each other, characters gradually changing, and building up mythology for Mewni. By the Season 3 premiere, the series expects the viewers to have seen most of the previous two seasons to follow the events both previous and going forward.
  • Critical Research Failure: Invoked. Literally everything Gustav says about Scandinavia, who seems to be under the impression that Scandinavia is a single country, when it is in fact a group of different countries, but this makes clear that Gustav does not really knows anything about Scandinavia.
  • Crack Pairing:
    • Marco being a Launcher of a Thousand Ships leads to a lot of these involving him, often as subsets of the "Marco's Harem" ship, itself an example of a crack ship. Marco has also been shipped with Moon and Eclipsa, despite the former being Star's mother and the later being the centuries-old mother of Marco's archenemy. "Moonco" shippers tend to involve a Time Travel Romance to pair Marco with the teenage version of Moon Butterfly, but "Marclipsa" shippers often just make a Mrs. Robinson out of Eclipsa. Marco's brief stint with the Monster Arm is also sometimes played up in regards to shipping him with Eclipsa.
    • There are some fans who ship Toffee and Queen Butterfly together. There's even an AU known as 'Mon!Star', where Star is their half-Mewman half-Monster daughter.
    • Likewise, shipping Tom and Jackie (who again, have never really met) has seen increased interest both on the basis of their complimentary personalities (giving Tom someone that can handle his anger issues) and desire from Starco shippers to make way for their ship without leaving too many broken hearts in its wake.
    • Some fans (and at least one of the storyboard artists) like to ship Justin Towers (lead singer of Love Sentence) with Ruberiot (the songstrel who composed Star's Princess Song). They've never met and what they have in common is being musicians voiced by a real life band's lead singer (Justin Towers is voiced by Nick Lachey of 98 Degrees and Ruberiot is voiced by Patrick Stump of Fall Out Boy), whose in-universe songs played in important Ship Tease scenes ("Just Friends" for Jarco and "The Ballad of Star Butterfly" for Starco).
    • People have been shipping the reborn Meteora with Mariposa even before the latter's birth, when she was thought to be a boy named Marco Jr. It's become less cracky as of "Gone Baby Gone", when the two of them ended up spending several years in Hekapoo's dimension and becoming close, even asking Star and Marco to make sure they're raised together again before they revert back to being babies.
  • Creepy Cute: Mewberty Star. A purple, multi-armed insectoid monstrosity... who is also adorable.
  • Crossover Ship:
    • The crew of Penn Zero: Part-Time Hero created the ship Pennar Butterfly, a joke ship involving the two leads of the shows.
    • Marco's "I kissed a ninja" shirt inspired some people to ship Marco × Randy Cunningham.
    • Star/Mabel is popular in some circles.
    • Marco (especially in his "Princess Turdina" persona) being paired up with Guy Hamdon (as SheZow) is surprisingly common.
  • Cry for the Devil:
    • Even if he's still pretty terrible all things considered, it's hard not to pity Ludo for desperately seeking Glossaryck's approval after we learn about his miserable childhood, and even harder not to respect his sheer determination to survive and recover stronger than ever after losing everything in the leadup to and aftermath of the Season One finale.
      Ludo: Worried about me? Don't you get it? I lost my army, my Kingdom, my clothes! And look – still standing!
    • Miss Heinous A.K.A. Meteora Butterfly is a very tragic figure who had to endure years of abuse because one half of her entire being was considered flawed and repulsive, making her unfit to inherit what should have been rightfully hers. This reaches its peak when in "Skooled", we get to see how her youth and teenage years really went down through the eyes of St. Olga.
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     D - F 
  • Darkness-Induced Audience Apathy: Season 4 has received accusations of this. Not only does Eclipsa, now the new queen of Mewni, struggle to be accepted due to her bad reputation, but her reign is shown to have pretty negative consequences on the kingdom.note  Meanwhile, Star's entire family, save for Moon, become painfully reviled by the mewman population for their perceived irresponsibility, and the Magic High Commission proceed to take several levels in jerkass, refusing to grow out of their bigoted attitudesnote . Just when it seems things are finally improving, with Eclipsa finally being accepted, improving as a queen, and reuniting with her husband, Mina Loveberry throws a Coup d'état with an army of Solarian Knights, complete with Moon, formerly one of the most reasonable characters in the show, suddenly distrusting Eclipsa enough to support this coup. Add in the finale's Esoteric Happy Ending, where Star destroys all Magic and merges all the dimensions together, which carries a lot of Fridge Horror, and it becomes really hard to care about what happens.
  • Designated Hero:
    • Star may be the hero of the series, but she has a lot of actions that paint her in a much less sympathetic light. She often acts impulsive without thinking about others, is prone to running away from her problems instead of trying to fix them, suffers little to no consequences for her actions, has rather self-centered behavior in regards to dealing with romantic interests like Marco and Tom even after her character development in season 3, and shows a lot of blatant hypocrisy in season 4 by expecting others to trust her, yet doesn't have the decency to trust others, and also by scolding others for exhibiting flaws that she is still shown to have. It gets even worse in the series finale, "Cleaved", where she pretty much commits genocide and yet suffers virtually no consequences whatsoever.
    • Glossaryk can also be considered this. He's intended to be a neutral character with a sense of mysticism, yet he's never clear with his intentions, and shows no regret/remorse when he shows tough love with those he's helping others, showing a very smug snideness. His scenes where he feels unappreciated for his efforts makes him look like an Ungrateful Bastard.
    • Moon is considered this in "Here To Help" and subsequent episodes. It turns that she was responsible for the attacks that Mina and her army inflicted on Mewni, thinking that Eclipsa was not fit to rule. Even if she never wanted any innocents to be harmed, and didn't want Eclipsa and Globgor caught in the crossfire, it doesn't change the fact that she was essentially planning a coup behind her back, and proves that she still doesn't trust Star to make her own decisions. Plus, she almost got Star and her friends killed. Her showing regret is all talk and no show, and thus Star scolding her is more than justified.
    • Pony Head really falls into this. In her first appearance, she tried murdering Marco out of petty jealousy. Subsequent episodes try showing more of her humanity, but with how narcissistic and egotistical she is, she looks like a near psychopath. Not helping things us how she's severely underdeveloped.
  • Die for Our Ship:
    • Jackie and Oskar are very hated for the Star/Marco (or Starco) shippers. It became worse for the former especially after the events of "Bon Bon the Birthday Clown" and "Just Friends".
    • Tom received this twofold. He got hate from Star/Marco shippers because he was a threat to both sides of the party. He is both Star's ex-boyfriend, and later current boyfriend again, making him a very possible threat to the ship. On the other side, he still receives hate for his Ambiguously Bi Ho Yay moments with Marco that make him also available for Marco, which makes another section of the shippers hate him as well.
  • Draco in Leather Pants:
  • Ear Worm:
  • Ending Aversion: The series finale "Cleaved" has been subjected to Fanon Discontinuity by a fraction of the fanbase due to the Inferred Holocaust of Star destroying all magic, which consequently killed off all magical beings (most notably the Magic High Commission and the Wand's spells), and merging Earth and Mewni (among other dimensions) together, which clearly terrifies those from both worlds.
  • Ensemble Dark Horse: Mariposa Diaz became popular even before she was born (back when she was known as Marco Jr.). Plenty of fans took an interest in her potential as a best friend and foil to the reborn Meteora Butterfly, which was only fueled further when the episode "Gone Baby Gone" showed the two as teenagers with a close bond.
  • Epileptic Trees: In "Into the Wand", Star focused on three past queens: Solaria, Eclipsa and Celena the Shy, but only Eclipsa's and Solaria's presence or actions had a major effect on the show's plot. Considering that Celena was described as having secrets and The Magic Book of Spells revealed that she and her descendants are all part demon, it's likely she was originally intended to have a larger role in the show.
  • Esoteric Happy Ending: A lot of fans felt that "Cleaved" ended up creating more problems than it solved. Star manages to destroy magic, stop Mina, save Tom, get together with Marco, and unite all the dimensions into one amalgam dimension. Happy Ending right? Not quite. What Star did ultimately killed all the inhabitants of the Magic Dimension as well as any being dependent on Magic to survive, Omnitraxus' and Rhombulus' lifeless bodies being shown, the deaths of the millhorses being shown in detail, and Hekapoo, Reynaldo, and Glossaryck all implied to have died in the process. The various dimensions may be united, but its caused a large amount of Culture Shock for both Earth and Mewni, the humans shown reacting in fear to the other dimensional beings, and the people of Mewni like Rich Pigeon adapting poorly to Earth elements. Mina meanwhile is both alive and still out there, and as she herself declares, so long as there are people with similar ideas to her, she will never really lose. Echo Creek is still in a panic from the resulting backlash of the Magic Dimensions destruction, the people of Mewni are in disarray from Mina's assault, and magic is ultimately gone for good. On top of this, Toffee was far from the only monster who loathed the Mewmans so much they'd refuse any kind of peace (including Toffee's ruler Seth, who unless Moon killed him with the Darkest Spell is an ageless immortal and thus likely still alive, and his species who can only be killed by magic) and those monsters now have an ideal opportunity to take their revenge. So while the series tries to end on a happy note, it gets marred by all the problems it created in the process, made even worse thanks to Fridge Horror.
  • Evil Is Sexy:
    • Toffee can be considered this if you're into that sort of thing, especially because of his voice, attitude and suave businessman demeanor.
    • Somehow, Meteora Butterfly, a.k.a Miss Heinous of all people, after she mutates into her true form. She looks noticeably younger, her hair grows longer, her physique changes from old lady body to a slightly more muscular figure with attractive monster features and her fancy Victorian era-style dress has become more revealing due to her transformation shredding it. She could easily be considered a Cute Monster Girl version of her monster father in this form. Her teenage "Grobb" version in "Gone Baby Gone" brought it closer.
    • Wyscan the Granter, the main villain in "Gone Baby Gone", is a being that willingly eats others to help fuel his powers. He's also quite the Pretty Boy.
    • Following her Face–Heel Turn, Mina Loveberry could qualify too.
    • This is played with in the case of Hekapoo, as she's not evil as much as she is amoral and bigoted towards monsters (and therefore antagonistic towards Eclipsa for most of the season), and she continuously goes through the Face–Heel Revolving Door eventually turning out to be the Token Good Teammate of her group.
    • Played with Moon as she was the actual cause of Season 4's main conflict, but after Mina double-crosses her, Moon wants to atone for her latest sin.
    • Even though most of Season 4's conflict traced back to her, Solaria the Monster Carver is quite the Amazonian Beauty.
  • Family-Unfriendly Aesop:
    • Played for Laughs in "Fortune Cookies" where Star decides the moral is "Love is never the answer!"
    • Played entirely straight in "Face the Music" where Star's attempt to use her Princess Song to give an honest impression of herself to the people of Mewni rather than be portrayed as a generic perfect Princess results in the Internal Reveal that the Royal Family lied to protect Star's reputation, inciting the peasantry to riot and damaging the Magic High Commission's trust in Queen Moon. The lesson, as plainly stated to Star by her mother after the fiasco, is that sometimes it's better to lie and pretend to be someone you're not, especially when you're in a position of authority where people depend on you.
    • "Monster Bash" teaches the lesson that you can't and shouldn't expect centuries of prejudice and bigotry to disappear overnight. It is possible for both sides to try to overcome their biases, but it is also too easy to fall back on them. Also, no matter how logical a change to the status quo may be, some will still viciously oppose it.
  • Fandom Rivalry: Some fans of Steven Universe have seen this show as a rival because both feature Magical Girls that were created by women who left relatively popular programs to make their own. Also, both shows have been known to reference anime.
  • Fandom-Specific Plot: Following season 3, fanart and fanfics regarding how would the kids of the main characters look like, as well as their ships would look as married adults, Tom/Star, Marco/Star and Tom/Marco are the most popular ones for this subject. Even less popular ships often have their kids designed, like Hekapoo/Star, Tom/Jackie, etc.
    • The particular variation of this for Tom/Star is also often popular with Deconstruction Fic, in which the ramifications of having a monster married to their ruler, as well as their mewman/monster hybrid child and how would they suffer from the Fantastic Racism that was shown to exist.
    • After the events of "Gone Baby Gone", fanfics set after the series that focus on Meteora and Mariposa have become increasingly common. One example would be Echo Creek A Tale Of Two Butterflies.
  • Fanfic Fuel:
    • The various alternate timeline Stars briefly seen in "Mathmagic" have some interesting AU potential, particularly the one where Mewberty seems to have been permanent and the one where Star seems to take Ludo's role.
    • Quite a few fans like to make OCs and Stand-in characters for past members of the Butterfly Family, especially the queens. It helps that the show never made quite clear the amount of Queens that there were in Mewni, despite revealing a large part of the first and all of the second dynasty members in side-material, so queens between the first queen of Mewni and Lyric (Skywynne's mother) are still fairgame to be played with.
    • The series ends with all the dimensions, namely Earth and Mewni, being cleaved together into one amalgam dimension, which opens up the floodgates for fanfics of all types.
  • Fanon:
    • Many fans, especially on Tumblr, believe that Tom is pansexual, both to ship him with whoever they want and because when he shows up in "Friendenemies", he is licking a ice cream fashioned in a similar manner to the Pansexual pride flag. In the show proper, he is Ambiguously Bi and has made quite a few comments towards or about Marco that can be taken either way.
    • Star's Mewberty wings are almost always depicted as ticklish, or sexually sensitive, in steamy works.
    • Star being jealous of Jackie's proportions, to the point of feeling insecure about her own body. In the actual show, Star does hold some jealously towards Jackie, but not in a silly, superficial way like that.
    • "Gift of the Card" made it popular to believe that Marco once took ballet classes. Incidentally, Marco taking karate lessons in order to impress Jackie.
    • Janna is always interpreted as having feelings for Marco since childhood, like how Marco himself had towards Jackie.
    • Festivia the Fun, one of the past queens of Mewni and considered a legendary party girl, is popularly characterized as a depressed alcoholic and Stepford Smiler, due to the fact that she was raised believing that her predecessor Eclipsa had abandoned her to run away with a monster. She also had to rule Mewni through a very dark period of its history, so it's not hard for fans to believe she dealt with high amounts of stress.
  • Fanon Discontinuity: Season 4 has been subjected to this by a good number of the fanbase due to characters being flanderized and/or coming off as Unintentionally Unsympathetic, character arcs being created then abruptly dropped, plot holes that contradict information from previous seasons/supplementary material that are never explained or brought up again, focus on the Myth Arc shifting to shipping drama, an underwhelming Big Bad, and an unsatisfying series finale that raised more problems than solutions.
    • Some who disliked the way the series and its characters were handled during seasons 3 and 4 pretend the series ended with "Battle for Mewni".
  • Fans Prefer the New Her: It's hard to find fans that prefer Miss Heinous from Seasons 1 and 2, over her Season 3 incarnation that gives her a makeover that makes her look better, as well as explore the depths of her backstory and traumas leading to her rampage, making her a villain that is both threatening and tragic, while previous incarnations showed her as pretty one-note evil and even somewhat comical.
  • Foe Yay Shipping: The Moon/Toffee pairing has gotten a significant amount of Fanart, largely due to being based in an AU where the circumstances of their matrimony would be much less squicky. Fans unaware of the setting are still likely to have this reaction to the pairing, even if Mon!Star is adorable.
  • Franchise Original Sin: The romance has often been seen as one of the show's greatest weaknesses in later seasons, but it's been like that since the beginning with the show constantly pushing a Star/Marco pairing despite them having more of a sibling-like dynamic. It worked better then since it was rarely in your face and they still showed support for each other, unlike later episodes, where it becomes the main plot despite them not having enough meaningful interactions in those later episodes.note 
  • Friendly Fandoms:
    • With Penn Zero: Part-Time Hero, since both shows involve the heroes traveling to other dimensions. Fans even wonder what would happen if Penn and Star cross paths... at least those who don't feel Star is overshadowing Penn, due to the two shows premiering very close together and the massive amounts of hype for the former, causing the latter to receive less attention. The creators even expressed interest in doing a crossover but Disney forbid it due to some new rule stating their shows are not allowed to do that anymore.
    • There seems to be an overlap between fans of Gravity Falls and fans of Star as well, and plenty of crossover art. This is likely due to the intro to Star having been first shown at a Gravity Falls ComicCon panel, which led to an explosion of fanart before the show had even premiered.note  The fandom overlap between Gravity Falls and Rick and Morty seems to have spilled over into this fandom by extension.
    • Some fans of Phineas and Ferb (which ended in 2015) also appreciate Star, due to both Disney shows having a quirky, energetic and upbeat tone. It also helps that Dimensional Travelling is canon in both:
      Aren't you a little old to still be watching Disney TV shows?
      Yes, yes we are.
    • They're in very good terms with the Miraculous Ladybug fandom, as well, mainly because of their similar premises (both shows have a Magical Girl protagonist), and the similarities between the two main protagonists (Marinette/Adrien and Star/Marco).
    • Despite the fandom rivalry with Steven Universe as mentioned above, there are a fair amount of people from both shows who get along well.
  • "Funny Aneurysm" Moment:
    • All of the Running Gags that involve Star's fear of St. Olga's Reform School for Wayward Princesses. Initially, Star's fear was played for laughs, but in the episode where they visit, as Star puts it:
    "It's worse than my worst nightmare".
    • After "Sleep Spells", Star's nervousness while talking to her parents earlier in the season and her extreme jealousy of Gustav's relationship with her adopted family seems less like normal teenager behavior and more like the product of a deep-seated neurosis caused by her overbearing mother. It gets even worse when season three reveals that Moon lost her mother when she was a teenager, and had to become a ruler at a young age. She imposes on Star because Moon didn't have Star's freedom or luxury to be reckless.
    • In "Sleep Spells", cheerfully says she has mother issues and at one point painted a picture of her mother as monstrous and antagonistic snake. Then comes close to the end of the show, when Moon has done a Face–Heel Turn into become a Smug Snake Big Bad Wannabe who is responsible for the destruction of Mewni and when Star finds out, saying she has mother issues would be an understatement.
    • The monsters responding to Star's hugs in "Fortune Cookies" becomes less of a one-time gag and more of an implied deprivation of affection with the revelation that monsters are the victims of a genocide, as "Mewnipendence Day" reveals, which wiped out the friendlier monsters, and that Ludo is the closest thing to a Parental Substitute due to taking them in and bullying them. It gets even more terrifying when Toffee exploits their need for affection and kindness to oust Ludo from his castle.
    • Marco's Gibberish of Love around Jackie in Season 1, especially in "Interdimensional Field Trip", becomes unintentionally foreboding. He's scared of talking to her because he's afraid of saying the wrong thing. In Season 2, Tom reveals he put a curse on Marco that forces him to blurt out his insecurities every time Marco tries to ask Jackie out on a date.
    • In the first half of Season 2, the Ship Tease between Star and Marco was played for laughs, complete with referencing the ship name in the third episode. Then in the Season 2 mid season finale, Star's unrequited crush on Marco comes to the surface, and she nearly ruins his date with Jackie and ironically she indirectly causes their First Kiss. Also, her obsession causes her to get distracted long enough for Ludo to grab her book of spells and Glossaryck... which is what makes Toffee's revival possible.
    • The below mentioned instance of Shipping Goggles has Adam McArthur interpreting the ending of "The Banagic Incident" as Star not wanting to be Just Friends with Marco. The fact that a latter episode is named "Just Friends" would make this Hilarious in Hindsight if not for the fact that said episode ends with Star utterly heartbroken over the prospect of being Just Friends with Marco.
    • Ludo's Imagine Spot in "Match Maker" about getting a "big boy body" becomes very pitiable in hindsight when the season 2 finale reveals that he was the runt of his abusive family and was bullied by them because of his birth defects not allowing him to develop that "big boy body" he wanted so much.
    • In "Game of Flags", when Star protests that her mother, Queen Moon, used to play Flags when she was Star's age, Moon solemnly replies "I did a lot of things you won't be doing." Fans interpreted this as Moon being a Former Teen Rebel, until in the season 3 premiere it's revealed Moon not only lost her mother and had to ascend the throne when she was Star's age, but made a deal with Queen Eclipsa in order to protect Mewni from Toffee's army of monsters, a deal that involved use of dangerous dark magic. She was far more mature than Star at that age, but in the most tragic way possible. It gets even sadder in the season 3 finale, when Star is forced to take on the role of Queen at a young age as well, when Queen Moon goes missing after she flees into the Realm of Magic.
    • Star quips in "Interdimensional Field Trip" that, "I was born to lead. Literally." Season 3 shows her having a breakdown over learning that no, she was not born to lead because her ancestor was a peasant girl taken from her parents and placed on the throne.
    • Miss Heinous forcibly uses the Solitary Conform-ment Chamber on herself, and looks happy once it takes away her cheek marks when reciting, "If your arms are on a table, you belong in a stable." Then she destroys St. Olga, her adoptive mother, in Season 3 upon learning that she's actually Princess Meteora, that St. Olga raised her to be an abusive clone headmistress, and she was robbed of her rightful claim to the Mewni throne.
    • Rafael and Angie's Pollyanna attitude towards Star's antics in the first 2 seasons becomes this when they admit in Season 3 that they're resentful of Star for "stealing" Marco away. They were willing to handle their house being full of hair, destroyed, and haunted, but losing Marco and realizing they no longer knew him was their Rage Breaking Point. Even the nicest parents have limits where their children are involved.

     G - J 
  • Genius Bonus: St. Olga was an actual saint and a real life princess. If you know her story, it would make sense to name a reform school for wayward princesses after her.
  • Germans Love David Hasselhoff: The show is surprisingly popular in Latin American countries, and a sizable amount of fan content for it online is in Spanish or Portuguese compared to other American cartoons. One of its leads is a Latino teenager, so this does make a degree of sense.
  • Girl-Show Ghetto: The show subverts this as it managed to acquire a huge following with boys, yet most of the merchandising still tends to lean towards women, and it's the only Disney XD show with a female main protagonist. It's also notable for being one of the few Disney cartoons ever created by a woman.
  • Growing the Beard: Although Star was a pretty good - if somewhat lightweight - show from the start, it's argued that it wasn't until "Mewberty", which was Darker and Edgier and saw an improvement in both its animation and storytelling, that the show truly came into its own. This got cemented by the end of Season 1, which coincidentally had its penultimate episode titled "Marco Grows a Beard". Afterwards, Season 2 improved the quality of the stories by putting focus on the characterization of the cast, being much more continuity-driven and interconnected, as well as becoming more serious without discarding the series' humor. The Season 2 Finale/Season 3 premier Multi-Part Episode is considered the show's peak, being rife with the humor, characterization, and story consistent of the shows highlights.
  • Harsher in Hindsight:
    • "Just Friends" ends with Star destroying a billboard with her green magic in the "Love Sentence" 's concert. It has become a bit jarring to watch after the Ariana Grande concert's terrorist attack on Manchester on May 22, 2017.
    • Star in Season One assures Marco You Are Better Than You Think You Are when he develops inferiority over how she's a cool magic princess and he's just an ordinary teenager. Come Season Three, Marco gets no respect for his actual heroic deeds.
    • Miss Heinous' Freak Out! when her cheek-marks are revealed become this when we come to learn the full extent of how she became like that and why she would freak out when that happened.
    • Rafael and Angie go Easily Forgiven toward Star for leaving them behind when they want to help her rescue Marco in "Storm the Castle," particularly because they were able to call her parents for help and Marco wasn't hurt due to Star's insensitivity. Rafael also revealed in "Hungry Larry" that he will go Let's Get Dangerous! if his family is threatened, and not to underestimate him. In Season Three, they finally admit they've hit their Rage Breaking Point and are resentful that Star "stole' Marco away, and they no longer even know him. What's more, they can't save him when his baby shower gift goes wrong.
    • In Seasons 2 and 3, we learn that Ludo is a product of severe childhood abuse and bullying, who tragically became a bully himself out of a desperate need to seem tough. Knowing this adds a tinge of sadness to a lot of his scenes in Season 1, in which he originally came off as just goofy and annoying. Of particular note is the way that Ludo alienates his monster minions with his bullying, causing them to abandon him in favor of Toffee. In hindsight, they were the Family of Choice that Ludo had adopted to replace his abusive family, and in the end he drove them to kick him out of the castle, just like Ludo's parents had once driven him to kick them out.
  • Heartwarming in Hindsight: After we learn that Jackie likes Marco because even in spite of constantly making a fool of himself he keeps going on, his interactions with Tom make more sense. Tom was ready to kill Marco in "Mr. Candle Cares" and yet Marco refused to give up even after losing 58 games of ping-pong. His determination made him respect Marco and change his mind, allowing him to hear what Star wants and accepting her choice.
  • Hilarious in Hindsight:
    • A while back, someone made a fanfic called Butterfly Kisses where Star grows large butterfly wings on her 16th birthday. In "Mewberty", after Star goes through her insect-phase and is back to normal, she ends up having wings. However, unlike Butterfly Kisses, Star's wings are much smaller and she can't really fly with them. Yet.
    • After "Blood Moon Ball", the lunar eclipse on September 27, 2015 that led to a real red moon practically became a meme for fans of the series.
    • Some fans of Dexter's Laboratory have made crossover jokes about said cartoon and Dexter. Star vs. featured a voice actor from Dexter's Lab and the actor who played the other Dexter as voice actors.note 
    • When Buff Frog decided at the end of "Is Mystery" to warn Star about Ludo's plans, well-known fanartist MoringMark drew a comic in which Star and Marco shrugged off his warning because his handwriting is completely illegible. Almost exactly four months later, "Raid the Cave" revealed that this is exactly what happened in canon, with the added detail of them having assumed the warnings were Fan-Art drawn by Buff Frog's children.
    • Among Star and Marco's voice actors, Eden Sher and Adam McArthur, respectively, Sher doesn't ship their characters and considers Star and Marco to be Better as Friends, while McArthur is a massive Starco shipper. Come Season 2, Star is the one with a crush on Marco, while Marco only sees him and Star as Just Friends. It's basically the reverse of what their voice actors think about Starco.
    • In the Japanese dub, Kana Ueda's role as Star is pretty hilarious if you know she previously voiced Hayate Yagami, a Magical Girl who also speaks in Kansai-ben, just like Star does in the Japanese dub as a Woolseyism. The main difference is the fact Star is the complete opposite of Hayate, in terms of personality.
    • "Running with Scissors" has Marco stranded in another world on an elusive quest, and becomes a Future Badass warrior on a motorcycle after many years of not having reached his goal. This gets rather hilarious when just one month later, the new season of Samurai Jack has its titular hero having done the same thing.
    • A fan created a Starco fanchild and gave her the middle name "Estrella" and a wand shaped like a pen. Many months later, more past queens of Mewni were revealed through a set of collectible cards. One of them had the name Estrella, and her wand appeared to be shaped like a pen. The fan took notice.
    • Someone made a fancomic about Star accidentally transforming Eclipsa into a baby. Then in the Season 3 finale Eclipsa turns her daughter Meteora into a baby, also by accident. This person was this close on predicting the outcome of the Eclipsa story arc.
  • "Holy Shit!" Quotient:
    • The ending of "Fortune Cookies" with the not at all subtle reveal that Toffee, the competent and menacing villain introduced in that episode, was to be the real Big Bad of the season.
    • "St. Olga's Reform School for Wayward Princesses". With Awesome Animation, Marco showing his skills as a Guile Hero and enough Nightmare Fuel and food for thought on how society regulates girls' behavior, it's probably one of the best Season 1 episodes.
    • "Mewnipendence Day" introduces the idea that while the monsters so far have been antagonistic towards Star, the people of Mewni are most definitely not innocent in the Monsters vs. Mewmans conflict. In fact, the Mewmans were the invaders.
    • "Marco Grows a Beard" has Toffee finally betray Ludo and steal his monsters' loyalty from him.
    • The entirety of "Storm the Castle".
    • "Bon Bon the Birthday Clown." Jackie and Marco go on a date and kiss, Star is jealous, indicating that she has feelings for Marco and realizes it, and Ludo wins.
    • "The Hard Way." Toffee is back.
    • "Starcrushed." Toffee merges Ludo's arm with his old skeletal hand (bonding with the crystal half), defeats Moon and ends the season victorious, most of the Magic High Commission (Hekapoo, Rhombulus, and Omnitraxus) are temporarily dead/in a coma, Lekmet has been Killed Off for Real, and Moon forces Star to leave Earth for good, giving her one final moment to confess her feelings for Marco before leaving without telling him why.
    • "Return to Mewni." Lekmet is officially confirmed to be dead seemingly without a way for revival unlike the other members of the Magic High Commission, Moon's mother was killed by Toffee's army, Eclipsa is confirmed to be alive, and Moon has spoken and made a deal/contract with Eclipsa.
    • "Moon the Undaunted." Eclipsa speaks for the first time in the series, shows off her blackened hand with veins, and she requires her freedom before she makes the contract with Moon.
    • "Book Be Gone." The Spellbook and Glossaryck are seemingly destroyed and killed, respectively, while Ludo makes his plan to take over the Butterfly Kingdom.
    • "Toffee." Star and Marco finally reunite, Star uses the Whispering Spell again to trap herself in Ludo's half of the wand and find Toffee, Toffee reveals his liquid form and the way he corrupts magic, Star achieves her Golden Super Mode, Toffee is Killed Off for Real, and Eclipsa's crystal has started to crack.
    • "Monster Bash" continues the trend of half hour episodes becoming game changing to the series. The episode starts with Star hosting a party meant to bring peace between the monster and mewman youth and it starts out really well. Then things take a turn for the worse when Mina Loveberry is shown to have abducted various monster guests which undoes a lot of the progress Star had been trying to achieve. Then things get more chaotic when Heinous arrives and unintentionally discovers her true identity as the interracial daughter of Eclipsa and her monster lover, leaving Star in complete disarray over her family history.
    • "Butterfly Trap" is one even in-universe. As Eclipsa turns tables on the Magic High Commission using the Box of Truth, the Magic High Commission reveals how they hid away Eclipsa's daughter and Moon reveals that the whole Trial By Box was a plan by Star, Moon and Eclipsa to reveal the truth about Meteora, as well as Star realizing she and her mother aren't really royals, Sean can be seen reacting to everything in absolute surprise, scare and unable to believe what he sees.
    • "The Tavern at the End of the Multiverse" has Star realize that the only way to stop Mina is to destroy magic so that all the Warriors are depowered. The finale has her going through with it.
  • Hype Backlash:
    • The Starco pairing can be seen as this by many people. Some people were turned off by those who were shipping Star and Marco before the show even premiered, accusing them of shipping Star and Marco simply because they were the boy and girl leads.
    • With some of the more controversial events, as well as the long hiatuses, the show itself began falling into this, with many people thinking it's overrated due to inconsistency.
  • Idiot Plot:
    • "Star vs. Echo Creek" when Star goes on the run. It starts by Marco expostulating that she'll go to jail for accidentally trashing a police car instead of suggesting that she fix it with her magic or have her father pay to cover the damage which Star says the King normally does. Star then decides to go on the lam thanks to Marco's Scare 'em Straight lecture, and only learns later that the car was decommissioned.
    • "Star on Wheels", where Star is stuck on a moving bike for ten minutes because she refuses to believe that pedaling backwards will stop it. What's more, she could have used the handbrakes or simply jumped off the bike. It gets especially ridiculous at certain points where Star jumps off the bike, only to land back on the bike and continue pedaling. The fact that not even Marco thinks of any of this is especially frustrating.
  • Inferred Holocaust: The series finale has Star, Moon, Eclipsa, and Meteora use the Whispering Spell to destroy the Magic Dimension, killing magic with it. While the deaths of the Millhorses, Omnitraxus, and Rhombulus are shown, and Glossaryck's and Hekapoo's are implied, they aren't the only ones affected by this. Every one of the Spells that lived in the wand were composed of Magic, meaning they'd die too, and said spells had children of their own. Anything Star created with Magic is likely to suffer a similar fate, including all the Laser Puppies made across the series, and Doop Doop the first spell. Then there's Reynaldo the Bald Pate, brother to the Magic High Commission, meaning he's also most likely dead. Any other civilizations in the multiverse that relied on magic for one reason or another will (at best) face significant societal upheaval and chaos, and at worst collapse entirely (if they don't outright die with magic). The actions of the four Butterflies were meant to avert potential genocide of the monsters, but they ultimately caused a genocide in the process.
  • It's Short, So It Sucks!: Even among the more hardcore fans of the finale, there are those who think it should've been at least an hour long note . This is especially notable since some recent series had finales that were an hour long.
  • Just Here for Godzilla: Numerous people watched the show in its final 2 seasons because Game of Thrones actress Esmé Bianco was voicing Eclipsa. Some went as far as to watch the show solely for her .

     L - P 

  • Launcher of a Thousand Ships: Marco is essentially the show's bicycle when it comes to Shipping; just look at Star, Jackie, Janna, Hekapoo, Tom, Kelly, Starfan13, Higgs, Brittney, Chantal, Eclipsa, Moon, and even Toffee.
  • LGBT Fanbase:
    • Marco's status as a Wholesome Crossdresser along with the "trans Marco" Alternative Character Interpretation has caused the character to get a large transgender following.
    • The large amount of Ho Yay in the show itself certainly helps, such as the same-sex kisses in "Just Friends".
    • The show's staff have been very encouraging of the LGBT community and their representation in media. Examples of it include same-sex couples in the background and Jackie turning out to be bi in Season 4.
  • Magnificent Bastard: Toffee of Septarsis is an enigmatic, devious monster with a flair for casual manipulation and a missing finger taken from him by Queen Moon in his days as a monster warlord. Coming into the service of inept Big Bad Wannabe Ludo, Toffee ingratiates himself into Ludo's service and manipulates him into firing Buff Frog, the one minion who suspects Toffee of any wrongdoing, before ousting Ludo from his own castle and using his new position to extort and destroy Star's wand. Seemingly dying after this, Toffee in truth lived on within one half of the wand's crystal, eventually taking over Ludo's body to enact his final plot to take his finger back and restore his power, wiping out almost every single person who can stand against him and even regaining his body back before Star manages to destroy him. Suave, perpetually calm, and a master of every situation he's in, Toffee remains one of the most cunning and effective foes to have ever fought against the Butterfly family. At the end of the series, he turns out to be Right for the Wrong Reasons: Magic is a dangerous weapon that should be purged from the universe, so even though Star was doing it for the greater good rather than vengeance, Toffee still ended up getting what he wanted.
  • Memetic Mutation:
    • It's gonna get a little weird, It's gonna get a little wild! note 
    • Toffee's completely out of nowhere declaration of "SURPRISE!" while sporting a Slasher Smile in the Season 1 finale.
    • JANNA BANANA!!!note 
    • "The Shipping Moon does not approve!"note 
    • "It's ya girl Marco!"note 
    • Thanks to Wham Episodes like "Bon Bon the Birthday Clown", "The Hard Way" and "Just Friends", the Mood Whiplash caused by the happy end credit music is getting there.
      [Any terrible thing happens to Star, or some big Plot Twist happens.]
      "I THINK EARTH IS A PRETTY GREEEAT PLACE!..."
    • "Mango" Diaz.note 
    • A meme somehow got started on /co/'s "Star vs" topics that Star smells like cinnamon. While nobody seems to actually know how this originated, it evolved into Cinnamon Toast Crunch being declared Star's official food (which Adam McArthur later claimed to be Marco's favorite breakfast during an in-character live chat on YouTube). Another evolution was giving Star the Fan Nickname of "Cinnamon Bun". Then the promos revealed that an episode would have Star wearing a cinnamon bun hairstyle.
    • "Between Friends". note 
    • Marco's expanding harem.note 
    • Star is a cuck/Starcucks.note 
    • "BWAAAH."note 
    • "B4"note 
    • "They (Tom/Kelly/Jackie-Lynn) deserve better". note 
    • "KELLEH"note 
    • Eclipsa is Mary Poppins'Y'ALL!!!
    • ENDGAMEnote 
    • A lot of fans applied Avengers: Endgame memes as the finale neared, especially fitting when the last four episodes leading to it aired three weeks since it's premiere, most notably:
      • "We're in the Endgame now." note 
      • "Whatever it takes" note 
    • Star committed genocidenote . Likewise, comparing Star to Thanos.
  • Moe:
    • Take one look at Star and try to say she isn't this.
    • Kelly in "Goblin Dogs" is this once she reveals her face.
    • Meteora Butterfly as a child is just precious.
  • Moral Event Horizon:
    • Toffee crossed it long before the show begun when he killed Moon's mother while a Mewman-Monster peace treaty was being signed. The Expanded Universe stuff makes this even more of one: Comet was a genuinely good person who'd been nothing but genuinely kind to the monsters and genuinely was trying to give them racial equality, and Toffee murdered her in cold blood. and if that's not enough, in "Toffee" he leaves the wand space he and Star were inside without taking Star with him despite what he'd promised Moon should she give him back his finger, and then coldly crushes the other half of the wand with Star trapped inside in front of her mother and her best friend without any kind of remorse.
    • Ludo apparently crosses the line in Season 2, when he forces the entire monster population of Mewni into bondage. If that wasn't it, then he most certainly crosses it when he tries to have Buff Frog killed for trying to escape by feeding him to his pet eagle, only changing his mind when his wand talks him out of it in favoring of offering him his job back. Needless to say, Buff Frog refuses, and decides to take it upon himself to warn Star of Ludo's plans. Whether or not Ludo truly crossed the line, however, is up for debate following The Reveal that Toffee was manipulating his actions via his wand.
    • Miss Heinous crosses it by wanting to execute Marco and displaying his skeleton in front of the rebellious princesses to make an example of him. That's if you don't think she already crossed it years ago by brainwashing her students into Stepford Smilers. Admittedly, this is muddled when it's revealed that Miss Heinous is actually a false personality forced onto Meteora Butterfly. Then she truly crosses it with The Reveal that she stole the students' souls as Miss Heinous and when she regains her memories, she moves on to steal souls from innocent bystanders while planning to reclaim the Mewni throne, even ignoring her mother's pleas to calm down and come with her.
    • The Magical High Commission (sans Moon) as a whole crossed this long ago when they conspired with Eclipsa's ex-husband, King Shastacan, to get rid of Eclipsa's half-monster daughter Meteora and replaced her with a peasant baby (Festivia), followed by omitting every mention of Meteora's existence in the official records and hidden archives of Mewni's and the Butterfly family's histories. For centuries they've hidden the fact that every queen after Eclipsa has been an illegitimate heir and that they robbed Meteora of her rightful place in Mewni's hierarchy and her identity, which led her to be turned into the awful Miss Heinous. It also raises the question of how much they wanted to put Eclipsa back in her prison was because of her supposed evil deeds, or more they were trying to cover their asses to keep the truth from coming out. And with The Reveal that Meteora as Miss Heinous was stealing the souls of the princesses sent to St. Olga's, it means they caused a bigger moral hazard than they anticipated. Individually however:
      • Rhombulus crossed it once his extremism went too far, freeing Globgor and causing a panic just so he can justify crystallizing Eclipsa and Globgor again. Tellingly, even Hekapoo and Omnitraxus, who equally distrust Eclipsa and Globgor, say Rhombulus went too far and order he be imprisoned.
      • Omnitraxus crosses it when he decides to support Mina's attempt at regicide and let Rhombulus out of jail to help, further proving he cares only for maintaining control over Mewni. While it seems Hekapoo supports the idea too, she realizes Mina is completely insane, and backs out of the plan, instead opting to save Star, Eclipsa, Moon, Marco, and Meteora before Mina can hurt them.
    • Mina Loveberry crosses it in "Monster Bash", when she tried to execute teenage monsters, just because they were monsters and later tried to kill Miss Heinous, who had just discovered that she was Meteora Butterfly, and thus emotionally stunned and defenseless against her. Any harm Star and Tom did to her in the fight against her is definitely well deserved (even if they were losing).
    • Ludo's mother had some sympathizers with the implication that she was abused and her husband was much nastier than her. But then "Ludo, Where Art Thou" revealed that she was just as self-centered and abusive towards Ludo and Dennis as Brudo was. So both of Ludo and Dennis' parents crossed the line long ago with their horrendous abuse of their children.
    • Moon crosses it in Here to Help. Just because they were so distrustful of Eclipsa and felt she was a poor ruler, Moon gave Mina's attempt at regicide the jump start it needed by restarting the Solarian program despite her own denouncing of it, and was secretly the one in charge of both Mina's and the Council's attempts at a Coup the entire time. Even the revelation they only intended to exile Eclipsa and her family rather than kill them, and wanted no civilian casualties, does nothing to lessen this, especially when Moon's grudge against Eclipsa was due to her interference during her fight with Meteora, leading her to end up in the Realm of Magic and be separated from her family... which wouldn't have happened had Moon not acted rashly and continued to attack Meteora when Eclipsa was succeeding in talking her down. They still willingly armed Mina thinking they could use them as a tool, only to unsurprisingly lose control, and put Star, her friends, and numerous innocent mewmans' and monsters' lives at stake in the process. All because they didn't like or trust Eclipsa who, at this point, has proven to be more trustworthy than them.
  • My Real Daddy: Though the show was created by Daron Nefcy, there are those who think that director Giancarlo Volpe, who worked on the similarly serialized Avatar: The Last Airbender, Star Wars: The Clone Wars, and Green Lantern: The Animated Series, was the one who truly helped the series improve, and that his departure caused the series to suffer a dip in quality.note 
  • Narm: Tad and Kelly's conversation in "Conquer" after the former is struck down by the season's Big Bad can come across as this. It tries to be deep and emotional, but the interruptions make it hard to take seriously.
  • Never Live It Down:
    • Marco's princess disguise from "St. Olga's Reform School for Wayward Princesses", which ended up being so popular that it gave birth to one of the show's most well-known theories (that Marco is a closet trans girl).
    • Despite his genuine attempts to improve in Season 3, Tom still has plenty of detractors who haven't forgot some of his more violent and manipulative actions in the first two seasons.
  • Older Than They Think: A lot of fans thought "Space Unicorn" was part of the show, and don't seem to realize Parry Gripp wrote it and released it five years before the series premiered.
  • One True Threesome:
    • Some fans who ship Starco but are fine with Jackie have just shrugged their shoulders and said, "How about a threesome then? Not like anyone involved dislikes anyone else involved?"
    • By season three, Tom/Star/Marco has become popular due to Star getting back together with Tom in addition to the amount of Ho Yay moments Tom and Marco had together. In "Conquer", Meteora calls Marco Star's "Other Boyfriend" and they share a group hug at the end, which is helped by their constant Threesome Subtext after that episode.
  • Painful Rhyme: From "St. Olga's Reform School for Wayward Princesses", Marco's "It's not criminal / to be an individual!"
  • Periphery Demographic: Being a Deconstructive Parody of the Magical Girl genre, the show's premise naturally attracted many older fans of shows like Sailor Moon, the creator herself being one. While Star is much more an Action Girl than your typical princess, the show also benefits from Marco taking a co-leading role with just as much screentime and development as Star, helping the show find a male audience even among younger viewers. Since its premiere, the show has been going down the checklist of Growing the Beard, with the emergence of a greater overarching storyline, a healthy dose of moral gray, major character progression for both heroes and villains, humor and themes that fly under the Radar like a stealth bomber, genuinely serious, frightening, and emotional moments without losing sight of the show's comedic heart, and a commitment to developing the setting with such a thick mix of Foreshadowing and Call Backs that some aspects verge on Continuity Porn despite the show having run for only four seasons.
  • Popular with Furries: Scalies received Toffee, Rasticore and the whole Septarian race with open arms. Toffee and Rasticore Evil Is Sexy appeal, as well as a certain appeal to Bara fans have made them fairly popular, and the ship between them quite common.
  • Portmanteau Couple Name: Loads of them.
    • Starco = Star/Marco. The first "StarFan13 LIVE" chat has StarFan13 (voiced by series creator Daron Nefcy) giving a substitute ship name, Marar. Nefcy had previously mentioned Marar on Twitter.
    • Tomco = Tom/Marco.
    • Jarco = Jackie/Marco. Alternatively, Mackie. Apparently, the composer for the series prefers the former over the latter.
    • JanTom = Janna/Tom
    • JanStar = Janna/Star.
    • Janco = Janna/Marco. Alternatively, Manna, which becomes an even easier possibility when taking into account "Mango Diaz" and "Janna Banana".
    • Marcapoo = Marco/Hekapoo.
    • Kellco = Kelly/Marco.
    • Rafangie = Rafael/Angie. Also, Rangie = Rafael/Angie. And Angael = Angie/Rafael.
    • Tomkie = Tom/Jackie.
    • Tomstar = Tom/Star. Also, Tomar = Tom/Star. Anti-shippers sometimes call it Tar, just to be insulting.
    • Tomstarco = Tom/Star/Marco. "Stomco" (Star/Tom/Marco) is also fairly used.
    • Tofficore = Toffee/Rasticore for those that see these two together.
    • Moonco = Moon/Marco.
    • Marclipsa = Marco/Eclipsa.
    • Spark = Spatziline/MoringMarknote 

     R - T 
  • Relationship Writing Fumble: Star and Marco are the intended Official Couple that the show spends its time working towards, while Star and Tom's relationship is a Romantic False Lead. However, a segment of the fanbase believed that the former pairing was a more platonic relationship. Meanwhile, the latter pairing spends so much time together, and had so many chances to break up that had them reconciling instead, that the idea of the series subverting the tendency of opposite sex leads ending up together to have Tomstar as the final pairing rather than Starco wasn't seen as unrealistic by the fanbase.
  • Replacement Scrappy:
    • Some fans soured to Kelly after she became essentially a replacement to Jackie in the story, as a possible romantic partner to Marco after the latter was Put on a Bus in a rather unceremonious manner.
    • A number of fans found Mina Loveberry to be a rather lackluster final villain when compared to Toffee and Meteora, due to her Cloudcuckoolander tendencies making her come out as less threatening and the fact she was only able to become a real threat thanks to Moon's assistance.
  • Rescued from the Scrappy Heap:
  • Retroactive Recognition: Jeremy Birnbaum is Cyrus Goodman and Bunga !
  • Romantic Plot Tumor:
    • Season 3 seemed obsessed with making shipping fans of the show as upset and confused as possible. Starting off, Star likes Marco but has to go back to Mewni, and Marco likes Star but is dating Jackie, but she dumps him, allowing Marco to move to Mewni to be near Star. Unfortunately, Star has gotten over Marco and is now back together with her ex-boyfriend Tom, despite just one episode prior still being obsessively in love with Marco and hating Tom. Meanwhile, while Marco is still pining for Star, the side characters of Kelly and Tad break up for the umpteenth time, but say this time is the final time, leading Kelly and Marco to have their own Ship Tease, in spite of the characters having very little interaction beforehand. The heavy and confusing teasing of several pairings simultaneously takes the focus off more lore-related plot lines, including the highly advertised Eclipsa plot, on which she just appears at random in other episodes (getting a grand total of only 3 episodes in the first half of Season 3) as a new mentor for Star and her intentions and plan still unexplained.
    • While Season 4 doesn't neglect the Myth Arc as much as Season 3, it continues the trend Season 3 began by stretching the romantic plot further and further despite telegraphing a "Starco" ending. In addition to showing the rocky nature of Star and Tom's relationship, primarily due to Star, the show offers numerous moments for the two to break up only to perpetuate the relationship. Then, Marco and Kelly get together in a g-rated version of Friends with Benefits so they can move on from their former flames, only for it to be brought up for only a single episode before they abruptly break up off-screen. Just as the hyped episode Beach Day appears to be setting up the moment they finally get together, it turns out to be a Red Herring and they remain friends. Quite a few were upset that the romance between Marco and Star was intertwined with the resolution of the Myth Arc and the battle against Mina, as Star and Tom broke up only 5 episodes before the end of the series, leading many to feel it was a rushed Last Minute Hookup.
  • Rooting for the Empire: Miss Heinous after she finds out she is Princess Meteora and that she was robbed of her birthright. Yes, she is scary, murderous, and violent... but she also had a horrible upbringing, with her memories in "Skooled" doing a well job of portraying her sympathetically (if not, a bit too well) and that she is technically just retrieving what should have been hers to begin with. There's also the fact that one of her victims is Pony Head.
  • The Scrappy:
    • Pony Head was this to some, due to having No Indoor Voice and apparently trying to murder Marco at one point. She does at least relent once Star chews her out. For some she's Rescued from the Scrappy Heap in her second episode (detailed above).
    • Some consider Ferguson this, due to him being an obnoxious, perverted Casanova Wannabe who is portrayed as a stereotypical overweight loser that tends to serve as The Load. Also, he draws faces on his belly. His friend Alfonso is one to a lesser degree, due to his No Indoor Voice and strange accent. This is part of the reason why both were demoted to extras in Season 2 in favor of Janna and Jackie. The other reason was because Daron Nefcy herself admitted she doesn't like either of them and only added them because Disney insisted on Marco having male friends thus resulting in her using them as little as possible. This was taken care of in Season 3, by giving them a proper send-off.
    • Oskar gained contempt from a considerable part of the fandom after his appearance in "Starcrushed", where he was portrayed as a delusional fool who dropped school to pursue a dubious musical career and acts hostile towards Star when she questions his absurd fantasies. The fact that he also suggested Star to replace Marco as her adventure partner made things worse (especially to Starco shippers). His new haircut didn't help him either.
  • Seasonal Rot:
    • While not unanimous, some fans believe the show started to decline in quality during Season 3A, not counting the opening TV Movie, "The Battle for Mewni", which served to wrap up all loose threads from Season 2. Reasons for this include the shipping plotlines increasing in prominence to the point of pushing out the show's Myth Arc, Queen Eclipsa's importance to the plot being rather poorly thought out (she doesn't get half as much screentime as the shipping plotlines did, even though she was advertised as if she'd be the new key player of the season), questionable writing choices regarding both Star and Marco (and Marco himself becoming a recurrent Absentee Actor, even when he went to live Mewni), the lack of a solid Big Bad to fill the void left behind by Toffee and Ludo, which wouldn't show up until the mid-season finale "Monster Bash", and Jackie Lynn Thomas being Put on a Bus. However, with that said, Season 3B was seen by many as improving from "Monster Bash" onward.
    • Season 4 is regarded as lackluster by a large fraction of the fanbase in comparison to the previous seasons for a variety of reasons. Reasons include the continued ignoring of the Myth Arc in favor of shipping drama, setups from past seasons having unsatisfactory conclusions or none at all, character arcs and plot points being introduced solely to create drama between characters, and Mina Loveberry coming across as a Big Bad Wannabe compared to Toffee and Meteora. Add in the flanderization of characters to make them Unintentionally Unsympathetic or needlessly antagonistic and the season feels like a step down in terms of quality, culminating in a finale that had a rushed, anticlimactic, depressing Esoteric Happy Ending that left many plot points and character arcs unresolved.
  • Ship Mates: Starco is frequently paired with Jackie/Janna, Janna/Tom, Ferguson/Alfonso or Jackie/Tom. Conversely, Marco/Jackie goes well with Janstar, Tomstar or Star/anyone who isn't Marco.
  • Shipping: Months before the show even premiered, many fans started shipping Star and Marco despite having little information about them other than the fact that they're the protagonists and friends. After the airing of the first episode, the ship firmly became the OTP. This was intensified by the events of "Blood Moon Ball", leading the fans to joke that "Even the moon ships Starco!" In addition, the two are based on the creator and her husband's personalities, and Marco's voice actor very openly ships Starco.
  • Shipping Goggles: Take any scene with Star and Marco and the fandom will interpret it as Starco fuel. This includes the scene in "Camping Trip" where Marco literally states quote, "I'm not her boyfriend." Even Adam McArthur gets in on this. He says in this video that his interpretation of the ending of "The Banagic Incident" is that Star swatted away Marco's pudding not out of anger that he underestimated her, but because she thinks the Banagic Wand has "friendship magic" and she doesn't want to be Just Friends with him.
  • Ship-to-Ship Combat: After "Bon Bon the Birthday Clown", this has become the norm for this fandom, where basically every ship involving either Marco or Star is in constant fight against the biggest ship on the fandom Star/Marco. Quite a few shippers are very toxic and have the habit of bullying or picking on people who ship other couples, particularly Tom/Star(which is accused of Romanticized Abuse by them), Tom/Marco and Jackie/Marco.
  • Ships That Pass in the Night:
    • Even though they didn't properly meet for a while, Tom and Janna became a popular ship. It helps that he is a demon, while she is a Nightmare Fetishist. Shippers were encouraged by the new season 3 intro, where these two are seen together as part of "Team Star".
    • While they never met in canon, there's an onset of shippers who pair Jackie with Tom owing to their contrasting natures: Jackie's calmness to Tom's (initial) Hair-Trigger Temper, Tom's demon heritage to Jackie's Fanon mermaid heritage, Jackie's water motif to Tom's fire, the list goes on.
    • Rasticore/Toffee largely due to being the only important members of their race in the plot. "Moon the Undaunted" shows that Rasticore worked for Toffee when he was a general. They became often shipped with each other on Tumblr due to an appeal to both the furry and bara fandom in their designs.
  • Shocking Swerve: The revelation that Moon is the one behind the restart of the Solarian warrior program thus giving Mina's regicide attempt to dethrone Eclipsa the jump start it needed. The reveal contradicts the many instances of Moon & Eclipsa forming a friendship, and the former's motives just make her look very petty as it's for reasons that are entirely her own fault.
  • Signature Song: "I'm From Another Dimension," known for being incredibly catchy and its memetic chorus.
  • Some Anvils Need to Be Dropped:
    • Season 3 tackles the concept of family; a person doesn't have to be blood related to be your family. If you do love and care for them, as they do for you, that's all that matters.
    • "Here to Help" has a rather harsh one: you can't be "moderate" between two sides of a conflict when one side is power-hungry, irrational and genocidal. Moon thinks she can use Mina Loveberry and the Mewmans who want her back as queen to get back her throne from Eclipsa "for the good of Mewni" and in hopes of preventing Mina from instigating genocide. It doesn't work; Mina double-crosses her and the Solarians that Moon empowered rebel and go rogue. Star in the next episode reads her mother the riot act for empowering Mina, a very idiotic move, and thinking there was any reasoning with her.
  • Strangled by the Red String: The popular "Starco" pairing ultimately suffers from this. For the first season and first half of season two, a good portion of Star and Marco's relationship can be interpreted less as romantic and more along the lines of Like Brother and Sister; Star being the adventurous hyperactive one, and Marco being the more responsible one to offset her. However, the second half of Season 2 began heavily pushing the idea that Star had romantic feelings for Marco, despite her behavior not visibly changing outside of some Clingy Jealous Girl moments, and continuing to hold obvious feelings for her crush Oskar. Afterwards, numerous characters, regardless of how well they knew Star or Marco, began claiming they could tell the two had feelings for each other, despite the lack of anything visible outside of friendship. This includes Marco's own father questioning his son as to why he's dating Jackie instead of Star. While Star getting back together with Tom was at first implied to be her attempt at getting over Marco, she ends up actually falling back in love with the fire demon. Meanwhile, Marco's relationship with Jackie fails, with her implying that he's actually in love with Star, something he doesn't acknowledge until Tad states it more directly a few episodes later. By season four, we're in an Unrequited Love Switcheroo, with Marco having feelings for Star while the other is happily in a relationship. Marco briefly enters a G-rated version of Friends with Benefits with Kelly, breaking-up with her offscreen. By time "Curse of the Blood Moon" came around, it's turned Up to Eleven, with Marco displaying odd behavior towards Star he had never displayed before, and while the idea is raised that it wasn't the Blood Moon that caused their feelings for one another, their relationship ends up returning back to how it was in earlier seasons once the curse is broken, albeit a bit strained. But once Star and Tom break up, by Tom's decision rather than Star's, and the group is in the Magic Dimension, Marco is suddenly stating he likes being close to Star since he's in love with her, despite their relationship again coming off as Like Brother and Sister. At this point, Season 4 had only five episodes left that were more focused on wrapping up the Myth Arc, making the potential relationship come across less as the characters genuinely being in love with each other, and more along the lines of the narrative pushing them together for the sake of having the main characters end up together.
  • Strawman Has a Point:
    • Marco in "St. Olga's Reform School for Wayward Princesses". As he points out while he and Star infiltrate the school, the princesses that they have encountered— Pony Head and Princess Smooshy— could do with a little character building given that Pony Head threatened to kill him for being Star's Earth bestie and Princess Smooshy tried to steal Star's face. Although he realizes that the school doesn't actually reform princesses with homicidal streaks, but instead makes them conform to a standard ideal, he makes a strong case for ladies that are a danger to societies and could do with a reduced ego. It's also hard to ignore his point where after she suffers brainwashing and snapping out of it, Pony Head Took a Level in Kindness to save him and then stay to save other girls from a similar fate.
    • Marco in "Blood Moon Ball" when he's suspicious of Tom's motives in taking Star to the titular ball. Star broke up with Tom because of his temper, and there might have been Domestic Abuse in her past; usually abusive relationships go in cycles, and any person might return in a period of kindness. Star not only refuses to stay at home with Marco, but also refuses to take him along to keep an eye on Tom. Even though Star handled herself just fine when Tom nearly killed Marco for accidentally stealing the soul-binding waltz, she was risking a lot. As "Curse of the Blood Moon" reveals, Tom would've forcibly bound their souls together, further crediting Marco's suspicions.
    • The guidance counselor Mr. Candle isn't wrong when he says that Star's career as Queen of Mewni will take over much of her free time, and she has to be careful when selecting a husband. Star's mother has told her the same thing during various phone calls, and even when Happily Married she and the king have their spats.
    • Queen Moon Butterfly isn't wrong in ordering Glossaryck to increase Star's training in "Page Turner". Glossaryck only starts training Star in Season Two, since he failed to help Marco in "Mewberty," and it takes ages for them to learn to adapt to each other. While Glossaryck takes offense at how the Queen is wasting his time and micromanaging him due to Star being left alone with a page on dark magic, he really should have been intense from the start.
    • While obviously it's the hormones from the pregnancy on Angie's part, and Marco's parents bear some responsibility for not keeping tabs on their oldest child, Rafael's comments about Star "stealing away" their first son aren't exactly unwarranted. The Diazes took in Star, cleaned up her messes, cared for her, treated her as a beloved guest and as one of their own children... and then she ran off when her mother forced her to return to Mewni, leaving Marco bereft, accidentally sabotaging his first serious relationship, motivating him to leave home semi-permanently and causing him to land in the middle of a dictated land and war zone. Rafael and Angie were doing all they could to help their son during his depression, and it wasn't enough. From a Certain Point of View, Star appears as a selfish and Ungrateful Bitch (even though it was out of her control). Star obviously didn't want to leave or for Marco to follow her to Mewni, and Marco chose to leave both times, but it's not like she kept in touch with the Diazes after her abrupt departure or told them why she had to leave. Marco isn't even getting the respect he deserves on Mewni, and if his parents know that, they may be questioning why he left in the first place.
  • Take That, Scrappy!: Meteora Butterfly ripping off Pony Head's horn in "Skooled!" and sucking the soul from her body in "Divide" were very satisfying moments for the people who never thought the latter was Rescued from the Scrappy Heap.
  • They Wasted a Perfectly Good Character:
    • In "Gift of the Card", we're introduced to Rasticore, a seemingly more dangerous and powerful villain than most of the others Star and Marco have faced. He also happens to be another lizardman just like Toffee and apparently had access to the same technology as Toffeenote  so there was definitely potential for him to be linked somehow to the first season's Big Bad. However, instead of the Knight of Cerebus and/or potential associate to Toffee one thought he should have been, Rasticore doesn't even get to fight Star and Marco. Instead, as soon as he finally finds the two, he gets disintegrated by the Quest Buy gift card in a matter of seconds. He takes until season 3 to come back to his former glory, but only for one episode before being reduced to an arm again. Season 4 shows that he is working on the Assassin's Guild, as a dishwasher, and is in no way connected to any of the show's conflicts, making people feel that where they could have gotten a really cool villain, they got nothing.
    • Jackie has often been underutilized in the series, even after becoming Marco's girlfriend and as such, most fans feel like they don't really know her despite seeing someone who is really interesting on the surface. This was made worse when Jackie broke up with Marco despite only being a couple for ten episodes. People believe that a lot of potential stories could have emerged due to Star's crush on Marco being revealed to Jackie. The stories were wasted by having Jackie break up with Marco because of his difficulty with merging with Earth culture. Jackie also took Star's confession really well rather than doubt her relationship with the two or becoming jealous/distrustful.
    • Toffee, despite being a cool and intriguing villain, gets very little in the way of actual depth. Most of season two is spent building him up as the next Big Bad, hinting at a cryptic backstory and hyping him up as a massive threat. Word of God calls him a Magneto-type, an extremist fighting for the rights of monsters, but since none of this is ever established in the show itself, he looks more like someone driven by petty vengeance over losing a finger, though this was never really clearly the only reason. By the end of the "Battle for Mewni", very little information has been divulged about the circumstances surrounding his murder of Moon's mother and why he usurped the monster leader, or even what his overall goal was in the present after regaining his body (although all of this does receive more details later...in a supplementary book). By the time he comes back to take center stage, he's unceremoniously killed off by Star. The most he gets afterward is a flashback to his younger days, which still raises more questions than provide answers.
    • Lekmet, the goat demon of the Magic High Commission. Unlike the other members of the MHC, he never gets A Day in the Limelight during Season 2 (which means that he also never gets to interact with either of the show's protagonists), and in the season's final episode, he pulls a Heroic Sacrifice in order to save Queen Moon and the rest of the Commission from the Toffee-possessed Ludo. This is a waste because the Commission ends up being even more relevant in seasons 3 and 4 , what with them being behind the conspiracy surrounding Eclipsa, her daughter and the Butterfly family. As the MHC's chairman, it would've been interesting to know what Lekmet's perspective and role on all this was, but alas he's too dead to share anything.
    • Tom was somewhat underutilized as Star's boyfriend. At the beginning of Season 3, it initially looked like another love triangle. Season 3 was about mending the historical racism between the monsters and mewmans, Tom and Star's relationship wasn't exemplified as a functional, interracial relationship until the second half of season 3, where it was mentioned offhandedly in the ending of "Is Another Mystery". Tom was eventually put to use in the second half of the season but still could have been utilized much earlier.
    • Season 2's episode Into the Wand marked the first appearances of the many queens to come before Star and Moon, particularly drawing focus (for both Star and the audience) on Eclipsa, Solaria, and Celena. Of the three however, only Eclipsa really ends up mattering to the plot, being the one to further the Myth Arc.
      • Solaria does serve as the motivation behind Season 4's Big Bad Mina Loveberry, but outside of that, contributes little to the plot. Her relationship to Eclipsa, namely that she's Eclipsa's mother, doesn't even come into the series until its close to its conclusion, and serves more as a footnote.
      • Celena serves little to the plot outside of being a queen. Her epitaph and tapestry makes a big deal about her hiding behind her wand, and her entry in The Magic Book of Spells mentions she is half-demon like Tom, making Star part demon.note  The attention drawn to her, combined with said heritage had potential for interesting developments in the plot, and for interesting parallels between Star and Tom due to similar heritage being revealed. However, by the series end, Celena is simply another queen amidst the many others, her demon heritage not even being mentioned In-Universe.
    • The Magic Book of Spells introduced Seth, the leader of the Septarians as well as Toffee's boss. It was under him that Toffee killed Moon's mother Comet, and he was described as a foil to Mina, being a monster that detests Mewmans to the point of wanting nothing less than their complete and total genocide. He was described in a manner befitting that of a Greater-Scope Villain, especially with Toffee's line before his death, proclaiming additional plans and knowing how things would turn out. Despite this though, he is entirely absent from the series outside of the book itself, not even getting referenced, and the final antagonist role is instead given to Mina.
    • The fourth season completely excludes Ludo, his army, and his siblings from the overall plot. A few episodes in, he gets back his army and castle and swears to be a better person. His only appearance afterwards was for ten seconds in the finale playing basketball with Dennis and inviting Star to join.
    • River's only involvement in the series finale is trying to get an injured Globgor to the magic temple. He never finds out about Moon's betrayal and support of Mina . It would be interesting to see what his reaction would be like.
    • Globgor. He serves as the big motivation behind Eclipsa's actions in Season 4, however, he ends up only being the focus of 2 episodes before being mostly sidelined. In the final episodes, he is quickly taken out of commission and soon left in a comatose state, preventing him from contributing more. Finally, while he is thankfully shown to be okay in the finale, he doesn't get a single line of dialogue, leaving some feeling he was wasted.
    • Pony Head also falls into this. She's still an entitled, snarky pony who doesn't develop at all. Her humanizing moments where she tries helping others feel like an afterthought.
  • They Wasted a Perfectly Good Plot:
    • In "Star on Wheels", Marco has Star's wand. It's shown that whoever wants to wield the wand can have it change form. Marco could have tried to use the wand to save Star, but the idea never crosses his mind. The season 3 episode "Deep Dive" later addresses this scenario.
    • "Spider with a Top Hat" takes place inside Star's wand. At this point, Star is of course missing a piece of her wand, and it has been acting up throughout Season 2, but the episode does nothing to explore it. Instead, the episode immediately following it has Star going inside her wand and exploring the matter of her magic not working right.
    • According to the writers, Marco was on Mewni for weeks during the Battle for Mewni special, and hadn't told anyone where he was going beforehand. This could have led to him being confronted by his parents (who would have been worried sick) and Jackie, who would have been angered that he didn't tell her or be distrustful of Marco for secretly running away to find a girl who just confessed her feelings for him and then proceeding to stay with her for a duration. But we saw nothing of that. Likewise, it seems odd that they went through a big setup of having Marco abandon Earth in order to have him live on Mewni for the duration of Season 3, when there was already a long period of him living on Mewni off-screen between the special and the start of Season 3 proper.
    • The implications of the main characters being able to go anywhere in the universe at the drop of a hat via dimensional scissors are never addressed, and in fact the scissors get outright ignored whenever they'd provide a too-quick resolution to an episode's problem. Even if they get used for some other purposes in the same episode. This is particularly jarring in Season 3, which treats Earth and Mewni as if they're separated in some important way (with Marco for some reason thinking he has to either abandon Mewni or abandon Earth forever in "Sophomore Slump") even though travel from one planet to another is easier than walking across a room.
    • Buff Frog becoming Mewni's new Monster Expert in "Starfari" ends up leading nowhere as, in his next appearance in "Is Another Mystery", he ends up leaving the kingdom with several other monsters. He does state that he was facing discrimination and was having trouble fitting in, but we never get to see that due to his absence in-between those episodes. He doesn't even appear in "Monster Bash", despite the plot revolving around an attempt in bridging Mewmans and monsters.
    • Season 3's episode Deep Dive had Marco use the Wand himself, it changing shape to a more monstrous design, and Marco temporarily gaining cheek marks of his own in the form of Crescent Moons. At the time, this created much speculation as only female members of the Butterfly family had exhibited cheek marks, and the design of Marco's version of the wand raised many questions due to prior forms of the wand reflecting their users. By the series finale however, the appearance of the wand is never explained, and Marco's cheek marks are written off as the result of exposure to magic, ignoring that no male magic users (except Jushtin Butterfly) possessed cheek marks,note  and that numerous female members of the Butterfly family in A Game of Flags possessed cheek marks despite having no indication they knew magic, or possibility of them wielding the wand.
    • The Magic High Commission being siblings and Glossaryck being their dad is information limited to the tie-in books, with the only time it's even remotely referenced in the show being "Meteora's Lesson".

     U - Z 
  • Ugly Cute:
    • Ludo's design starts off very much like this. He has noticeably smaller, bloodshot eyes, and many shots paint him as relatively unappealing. When derobed at the end of Season 1 he is shown to be horribly malnourished. To offset these, he's only 2 feet tall, he has a somewhat naive, childish personality, and some of his mannerisms make him outright adorable. It also helps that he wears overly long robes that make him look even smaller than he really is. Even Star's expression in "Freeze Day" when she switches Ludo's skull with her cactus hairband suggests she finds him cute. It's helped along more in Season 2, where he's subtly redesigned to have larger, more expressive eyes, coinciding with his Character Development and full onset of Jerkass Woobie status. At first, what were assumed to be warts in his design proved later to be feather plumage. The further the show progresses however, he starts to move towards Ridiculously Cute Critter territory.
    • Buff Frog is a big tubby frog monster with a tough guy attitude that is completely counteracted by the way he gushes over his tadpole babies and genuinely tries to be a good dad.
    • The Giraffe Monster deserves special mention here as well. It's particularly adorable-looking when it smiles.
    • Eclipsa's monster husband Globgor. He's a monster that looks like a Big Red Devil, but it's not hard for fans to see what Eclipsa saw on him as he looked like a strong, jolly fellow.
  • Uncanny Valley: Star's makeup and Icy Blue Eyes rub off some viewers the wrong way. This is ironic since she's supposed to be cute and friendly.
  • Unintentionally Sympathetic:
    • Surprisingly, Season 4 manages to turn Toffee into this. Despite all the wretched and horrible things he did as the Big Bad of the first two seasons and the beginning of Season 3, thanks to the various actions of magic users across the season, many have come to see Toffee's crusade against magic as justified. Even Star herself thinks Toffee had a point after seeing the destruction Moon and Mina's army of Solarian warriors has caused Mewni, noting that none of this would have happened had she not restored the Magic Dimension. His main fault ends up being less about his views on magic and more the lengths he was willing to go to achieve his goal, to say nothing of his vision for the future once magic was gone being one where all Mewmans are annihilated. Although even then, one can have sympathy for him given that Glossaryck clearly had the chance to steer him right but didn't actually try just Because Destiny Says So.
    • Mina is considered this in "Cleaved". As much as she's is portrayed as being a hate filled irredeemable fanatic, seeing her past as a shy lowly peasant girl who got infused and mind broken with magic and being the only one of her kind makes her present persona quite tragic especially as it was never made clear whether she truly hated monsters or it was introduced and amplified by Solaria's magic. And after centuries of being dedicated to Solaria's cause, her hero and the one who made her a Solarian warrior, she finally meets her ghost and begs her for help only to receive a death glare from her and left to be drowned by the Unicorn without even an explanation as to why her idol changed her beliefs.
  • Unintentionally Unsympathetic:
    • Glossaryck. Initially introduced as Star's tutor, he provided "useless" information to Marco in season one, and speaks in riddles that often confuse Star while teaching her at the same time. Instead of coming off as a sympathetic ally, he comes off more as an unlikable Jerkass Wild Card. His role in "Page Turner" where he was supposed to be in the right and "Book Be Gone" where he is supposed to be pitied both fall on deaf ears with many feeling he brings the bad things upon himself.
    • Marco throughout most of Season 3 falls into this. He leaves everyone he loves and cares for on Earth to go to Mewni to be with Star, pretty much dropping into her home life unannounced, all because he wants to feel special. The fact that, most of the time when the show tries to paint him in the right or make him feel guilty, he's either hypocritical or the other person's points have more validity. And that's not even getting into "Booth Buddies".
      • He also falls into this in "Cleaved", as Star never told him that magic would return everybody back to their proper dimension, so he also willingly abandoned his family and friends on Earth who, mind you, wouldn't have known where he was or what was of him.
    • Pony Head really follows this trope to a tee, mainly from how she acts like an entitled brat who never really grows from her experiences, and always thinks she's right. Almost any time she's meant to be seen as a victim, like in "Skooled" and "Bam Ui Pati!", she's more like an Asshole Victim who deserves what she got.
    • The Spiderbites, or at least the King and Queen. While their hatred towards Globgor is understandable for the fact he killed their ancestor, said ancestor was King Shastacan, possibly as much of an Asshole Victim as it could get and they act passive-aggressively the whole time they are visiting Star and Eclipsa about it.
    • Star has had this problem since the beginning, but she really falls into this in Season 4. Despite the increasing issues with her relationship with Tom due to her hiding the fact she kissed Marco from him, Star repeatedly refuses to acknowledge her shortcomings and either turns the accusations back on the accuser, or tries to runaway from the problem entirely. Outside of Tom, her attempts at maintaining the moral high ground when dealing with Eclipsa often fall flat due to the numerous bouts of hypocrisy she exhibits, primarily in regards to demanding trust from Eclipsa despite offering none herself and scolding her for not caring what her people think of her, even though a part of Star's growth as a princess and future queen had been about becoming her own kind of ruler and doing things her own way while being true to herself and doing what feels right to her even if others don't agree. It's taken to its extreme in Tavern at the End of the Multiverse. Once Star has decided that magic needs to be destroyed to prevent the completion of Mina's genocide of the monsters, her only concern is the fact that doing so will force Marco back to Earth and make them incapable of seeing each other again. This in spite of the fact that doing so will not only rob all life of magic, not just Mewni, but will also kill everything reliant on magic to live, including Glossaryck, the Firstborn Unicorn, and presumably Hekapoo. Arguably this launches Star straight into Well-Intentioned Extremist or even Knight Templar territory, given that there are hundreds of thousands if not millions or billions of beings made of magic in the multiverse (the Spells, the Magic High Commission, and everything and everyone that lives in the Magic Dimension just for a start) and she'll presumably be killing all of them solely to save one country (hers) in one dimension (hers), a genocide comparable to if not bigger than Mina's. Yet Star's only concern is that she won't get to see Marco ever again.
      • The series finale, "Cleaved," somehow took this even further. She goes through with destroying magic, essentially killing million of magical beings, or anyone heavily dependent on magic. Not only was her only concern being that she would never see Marco again, she was willing to abandon her family and friends on Mewni solely to be with him regardless of any potential trauma they could have succumbed to. The extremely morally dubious nature of both of these decisions rocked the fanbase so much that a portion genuinely began questioning whether Star became something like a villain herself.
  • Unpopular Popular Character: Eclipsa falls into this, as she's feared and hated by many in Mewni due to her marrying a monster and practicing dark magic, but became well-received by the fans, to the point where many fans felt Eclipsa nonetheless acted like a better mother to Star than Moon ever did.
  • Viewer Gender Confusion: In "Ransomgram", said ransomgram was delivered by a small monster courier who was initially mistaken for male by many viewers. This was probably partially because she is lacking Tertiary Sexual Characteristics (and is too short to have a visibly feminine figure), and partially because her voice could be mistaken for a young boy's. In her second appearance, "Out of Business", the misunderstanding is cleared up when she is referred to as female.
  • Viewer Species Confusion: A few fans who are used to Japanese media tend to mistake Ludo for a Kappa, which Ludo does vaguely resemble due to having a specific hairstyle that mimics them. The second season makes clear that Ludo himself is really supposed to be a small bird monster that never managed to grow wings, unlike the rest of his family who are much more birdlike in appearance. But then it was revealed in The Magic Book of Spells that despite being birds, their species name is "Kappa".
  • What Do You Mean, It's for Kids?: This Disney series can get surprisingly dark. There is a good amount of subtle suggestive content, multiple cases of not-so-subtle innuendos, some relatively serious and mature themes, horrifying situations and dangers. It only gets worse with the arrival of Toffee.
  • What Do You Mean, It's Not for Little Girls?: In addition to the aforementioned more subtle content, Marco's status as the second lead getting almost as much screentime and development as Star helps make the show more accessible even for younger boys despite its girly surface.
  • What Do You Mean, It Wasn't Made on Drugs?: You would be excused for believing that this show was made on a cocktail of cocaine, LSD, Pop Rocks, soda and Smile Dip.
  • Win Back the Crowd: After Season 3A was thought to be a decline in quality due to focusing a lot on shipping and relationship drama at the cost of the Myth Arc, Season 3B hit the ground running with the first three episodes moving said arc along, with "Butterfly Trap" in particular being a major Wham Episode. The two-part season finale "Divide" and "Conquer" was considered so good that it was cited by several fans to be the chief reason they even stuck with the show for Season 4.
  • Win the Crowd: When the intro was shown at the 2014 San Diego Comic-Con, a recording of it was uploaded to YouTube. In a short time, the show already had a large fanbase (and plenty of people shipping Star and Marco) months before it even premiered.
  • Woolseyism:
    • In the Japanese dub, many of the people from Mewni, like Star, her family, and other few characters, speak in Kansai-ben as a way to make them sound more alien compared with the rest of the human cast. Oddly enough, this is averted with Kazuyuki Okitsu (Marco), since he hails from the Hyogo prefecture, but he speaks in Standard Japanese (Kanto-ben) instead.note 
    • Interestingly enough, this is averted in the Latin American Spanish dub, as everyone speaks neutral Spanish, including Marco. This is especially relevant here, because both the dub of the series and his voice actor (Demián Velazco Rochwerger) hails from Argentina, and he originally planned to voice him with a Mexican accent, but this was rejected by Disney's Latin American branch.
    • In the Russian dub, Buff Frog's real name went from stereotypically Russian Yvgeny Bulgolyubov to stereotypically Polish Kshishtof Sabanentski.
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