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Introducing the Isekai Cinematic Universe!
"In this universe, mirrors of worlds exist. In these worlds, our characters are living each one of their own lives. However...what if, the worlds have changed?"
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Isekai Quartet (異世界かるてっと Isekai Karutetto) is a Japanese anime series that serves as a chibi-style crossover between the light novel series KonoSuba, Overlord (2012), Re:Zero − Starting Life in Another World, and The Saga of Tanya the Evil, all published by Kadokawa Corporation.

In the world of each of the series, mysterious buttons appear out of nowhere. When each of the series' protagonists inevitably press the buttons, them and their supporting casts are suddenly teleported to a mysterious high school. Hijinks ensue.

It was licensed by Funimation with an English dub being released on April 27, 2019. A second season of the series, with the addition of the cast of The Rising of the Shield Hero, premiered on January 14, 2020. A third season was announced at the end of the second season.

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The anime has examples of the following tropes:

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    A-C 
  • A-Cup Angst: Shalltear is none too pleased when Aqua mentions that padding one's chest is something to be ashamed of, as well as being rather nervous and self-conscious when she sees Rem's chest size.
  • The Ace: Reinhardt is this to a hilariously exaggerated degree in Episode 11, always having some divine protection that helps him such as Tug-of-War divine protection.
  • Adaptational Jerkass: In class 2's version of Cinderella performed for the school festival, the titular character is far more rude, aggressive and arrogant than many other versions as a result of Ram playing the leading role.
  • Advertised Extra:
    • Viktoriya Serebryakov is billed as the heroine/deutragonist of The Saga of Tanya the Evil as seen in the opening and promotional posters. In the actual show however, she has little to no focus and rarely talks to anyone from the other casts. In fact, she didn't even sing the ending credits with the other heroines, with Tanya taking over for her in the first season, though she gets her chance in the second ending credits and in general gets more focus and interactions in the second season.
    • A lot of fanfare was made out of the cast of The Rising of the Shield Hero joining the show. Come the season premier however, it turns out they're new transfer students of Class 1, not Class 2 with the actual main characters.
  • All Take and No Give: How the relationship of Subaru and Rem come off as in this series. It is blatantly obvious that Rem is completely devoted to Subaru and would do anything for him, but he appears to only have eyes for Emilia and it looks like he ignores her. Made the most apparent when Subaru cried Tears of Joy at Emilia giving him a small box of obligatory chocolates, to the point of ignoring the gigantic heart shaped box Rem was giving him.
  • Always in Class One: Averted. The main characters are shown going to Class 2. This aversion is especially bizarre, since at first, there weren't any other students shown at the school. Episode 10 revealed that Class 1 was largely empty until recently, when several more denizens of the four worlds were dropped there, including the Pleiades Maids, Reinhard, Felt, and Julius, and Chris/Eris. Their teacher meanwhile is Vanir. While there are no visible students from Tanya's world, a Freeze-Frame Bonus lists Tweet Nika Teyanen as absent from class, implying he either was meant to come but couldn't due to the rotten potato he ate, or did come and got sick again. Season 2 adds Naofumi, Raphtalia, and Filo to the class as well. Episode 11 shows there is a Class 3 which might just be Yunyun.
  • Amazon Brigade: Season 2 episode 11 has Albedo, Emilia, Aqua and Visha team up against the revived Destroyer with Raphtalia and Filo on their way to help.
  • Anti-Climax: The Calvary Battle between Class 1 and 2 in the Season 1 Finale gets interupted before it can really start. This ends up being noteworthy since the previous episode was hyping up the showdown between Ainz and Reinhardt.
  • Arbitrary Skepticism: Megumin refuses to believe Subaru's claim that Chomusuke breathes fire, saying that Chomusuke is just a cat, ignoring all manner of magical creatures she's aware of and/or surrounded by, or that Chomusuke has wings.
    • Despite all the strange characters at the school, nobody besides Ainz believes that Aqua is a goddess.
  • Arson, Murder, and Jaywalking: Ainz words his Badass Boast of the Season 1 finale this way:
    Ainz: Tanya, who do you think you're talking to? I am the lord of the Great Tomb of Nazarick, the Sorcerer King, and the vice-representative of this class!
  • Artifact Title: Season 2 adds the Shield Hero gang to the cast, making the "Quartet" of series in the title into a quintet. However, in story they're in a different classroom, which means the core group of 4 protagonists (Tanya, Ainz, Subaru and Kazuma) is still intact. In a way, this is zigzagged.
  • Art Shift: Compared to the series' usual Puni Plush art, the ending credits are done in a 16-bit video game style.
  • Ascended Meme: Aqua reenacts her memetic crying face on Season 2 Episode 10. After being yelled at by Kazuma as well.
  • Aside Glance: Kazuma does this: first in the OP, second at the beginning of Episode 2 of the show proper, and third during Episode 9.
  • Aura Vision: Ainz briefly sees an aura visualisation of Subaru's "Return by Death" in his heart when they shake hands, drawing his curiosity.
  • Badass Boast: Subaru gets one in Episode 12.
    Subaru: That's why, when in a fight where I'm risking my life, I won't lose to anyone!
  • Bait-and-Switch: Naofumi opens the door in the beginning of Episode 13, only to close it later - and then Roswaal informs the class that no, Naofumi isn't their new classmate.
  • Beach Episode: Episode 9 has the whole class go to the beach for a field trip.
  • Be Careful What You Wish For: Kazuma expresses his selfish desire to stay in this world. The BAD NEWS is that he says this in front of Tanya who will put him through Training from Hell 24/7.
  • Berserk Button: Thanks to her interactions with Being X, Tanya really cannot tolerate the presence of those who call themselves gods or who have the guise of one.
  • Beware the Silly Ones: Aqua, who is her usual ridiculous and egocentric-self, manages to make Ainz scream in pain and knockout Shalltear with her magic. For context, in the world he's from, Ainz is so utterly powerful and nigh-invulnerable compared to everyone else that calling him a God-Emperor is more accurate than not on both ends of that trope, and Shalltear is the Man of Kryptonite to Ainz himself, with all of the absurd power that such a position comes with. Using just a "low level holy spell", Aqua manages to not only cause Ainz real damage in what seems like forever with the kind of magic he's supposed to have resistance to, but also possibly renders Shalltear fully unconscious. Even if it didn't actually hurt her (we don't see her actually get hit or affected by any kind of splash damage), the holy power it packs is enough to terrify Shalltear into unconsciousness and seriously put the rest of Team Overlord on their guard.
  • Beyond the Impossible: Ainz is an Level 100 Elder Lich, and thus, should be all but immune to any low-level holy spell despite that brand of magic being his race's one major elemental weakness. When Aqua uses the common Turn Undead spell on him, Ainz is shouting in shock and pain as this is actually affecting him much more than it normally and logically should; the spell also renders Shalltear unconscious as collateral damage. Justified since Aqua, incompetent and bumbling when it comes everyday life as she tends to be, genuinely is the Physical God she constantly claims to be...at least, when Crippling Overspecialisation isn't handicapping her.
    • With Season 2 we see Rem, who for all intents and purposes is a mere oni who is just stronger than the average human and doesn't possess any other abilities besides super strength, speed, and stamina, is able to restrain both Albedo and Shalltear with her chain mace at once. Remember, Albedo and Shalltear are the two strongest Floor Guardians, with the latter being created specifically to kill Ainz. It's a mystery why the two of them struggle to break out of her chains unless Rem is actually much stronger than she's letting on.
  • Big Eater: Viktoriya. She spends a lot of time going to the butchers after school and season 2 episode 8 has her eat the special lunch that is larger than she is. She even states one of the reasons she takes on so many jobs is because they also offer free food.
  • Big Damn Heroes: At the end of Episode 13, when Raphtalia and Filo are about to be hit by a baseball flying at them at very high speeds, Naofumi delays the ball with two Air Strike Shields before jumping in the way and proceeds to deflect the ball with his shield.
  • Birds of a Feather: Episode 4 plays with this dynamic between Ainz & Tanya and Kazuma & Subaru.
    • Tanya and Ainz both attempt to intimidate the other with their Battle Aura over a misunderstanding that Tanya believes that Ainz must be Being X. Once they clear that up, however, they actually hit it off learning that they both originate from Japan and had similar backgrounds before being summoned/reincarnated.
    • Kazuma and Subaru initially hit it off when they start comparing how being summoned to another world wasn't as glamorous as they were led to believe. Their budding friendship breaks down though when Subaru leaves out his actual suffering experiences and unintentionally brags about living in a mansion and his Love Triangle with Emilia and Rem, much to Kazuma's jealousy.
  • Blinded by the Light: Demiurge uses a Flash spell on Kazuma when he and Tanya caught him spying on the girls in their swimsuits.
  • Book Dumb: Ainz, of all people, turns out to be this. He never graduated from middle school. Unsurprisingly, Aqua and Felt are also this.
  • Borrowed Catchphrase: Albedo starts randomly saying "DEATH!" after being taught the ways of love by Betelguese.
  • Brilliant, but Lazy: Kazuma, the resident and very resourceful Guile Hero and entrepreneur of his home series, proclaims without shame that he really hates hard work, is perfectly content with staying in this world, and not doing nothing on field day while leaving the rest of his classmates to pick up the slack for him. Unfortunately, he makes the Tragic Mistake of saying this outloud in front of Tanya.
  • Brutal Honesty:
    • Self-inflicted. Subaru introduces himself as both clueless and broke.
    • During her introduction, Beatrice doesn't bother to hide what she thinks of the whole situation.
      Beatrice: I'm Beatrice, I don't think it's really nice to meet any of you.
    • Seems to be a theme with the Re: Zero characters, as in the next episode, Rem talks about her crush on Subaru, with Subaru sitting right next to her.
      Rem: When you fall in love, it doesn't matter how long you've known someone! [...] I've barely known Subaru-kun for any length of time at all, and he's very important to me.
  • Butt-Monkey: Rerugen. He has the role of a teacher in this universe, but he clearly gets no respect from anyone. First, he's forced to partake in the talent show in Episode 5, and publicly humiliates himself in the process. Then, in Episode 11, he gets roped into helping the teacher's team for the final event of the field day, but he's pretty much considered The Load—he gets eliminated fairly quickly, and his teammates don't seem to care.
  • Call a Rabbit a "Smeerp": Episode 14 has Kazuma, Koenig, Neumann, Warren and Aqua call wine "red stuff". Throughout the episode they refer to alcohol as "stuff" with Aqua saying she originally wanted some "bubbly stuff". Tanya later calls alcohol, the "water of life".
  • Call-Back:
    • Let's say this isn't the first time both Aqua and Megumin felt the uncontrollable urge to press a mysterious button, despite not knowing what it could do.
    • In Episode 2, Subaru introduces himself to the class in exactly the same way that he first introduced himself to Emilia. The Overlord cast also reprise the way they presented themselves before Momonga/Ainz.
    • Why did Aqua's attack only damage Ainz where it knocked out Shalltear? Because as Ainz's stated before, he has a higher Magical Defense than her.
    • Episode 9 features Darkness being forced to do push-ups, with her boobs bouncing all over the place. Something that already happened in the first Konosuba OVA (though, unlike Kazuma, Cocytus probably didn't have any perverse ideas in mind when he ordered this).
    • Demiurge pretty much instantly figures out the world's gimmick, and naturally assumes Ainz did too, resulting in Ainz having to repeatedly fish for information on "that thing" while internally screaming that he doesn't know what Demiurge is talking about, similar to the scene in Overlord when Ainz first discovers "his" master plan to conquer the world and trying to figure out "that one time" when he gave Demiurge that idea.
    • Episode 14 has Naofumi refuse to help Aqua when she says she'll give him divine protection, saying anyone that talks about god isn't trustworthy. This references to the issues he had with the Church of the Three Heroes.
    • Season 2 episode 7, has Pandora's Actor geeking out over both the uniform Viktoriya wears and Megumin's Crimson Demon persona. This all comes back to Pandora's Actor being created by Ainz back when he was going through his Chuunibyou phase.
  • Call-Forward: Season 2 Episode 9 has one specifically towards KonoSuba. Tanya is drilling Megumin on how to make her Explosion spell more effective and advises Megumin to cut down on the incantation time, which she utterly refuses to do because long incantations are cool to her. Kazuma wonders aloud if she even needs one, since the words are always different, a point that's glossed over in the Konosuba anime. This references one of the light novels the Konosuba anime doesn't cover, where Megumin's mastery over Explosion gets to the point where she really doesn't need an incantation for it.
  • Calling Your Attacks: Subaru with his Benchpress 80 kilos throw in Episode 12.
  • The Cameo: During a brief cutaway in episode 7 of Season 2, it has Sebas showing Wilhelm a picture of Tuare.
  • Cassandra Truth: Tanya, despite her hatred of self-proclaimed gods, never registers Aqua's proclamations of being a goddess because she acts too silly to be one. Once she actually does register Aqua as being a Goddess she tries to kill her under the suspicion that Aqua is Being X before being calmed down and realizing that Aqua's too stupid to be Being X.
  • Character Shilling: The series goes out of its way to portray Tanya as an incredibly overpowered character who can stand up to Ainz and is presented as his equal. It's a bit jarring given that canonically, Ainz is, with only a few potential exceptions, the strongest character of the cast in his home series. For example, Tanya is able to match a powerful combo spell fueled by Ainz's "Nuclear Blast" and Megumin's "Explosion" with a magic barrier powered by Being X's Blessing.
  • Cheaters Never Prosper: Even though Ainz cast Time Stop to try and cheat on the test, Aqua is the only character unaffected by the spell that actually cheated. Sure enough, she is caught doing so by Roswaal and made to stand in the hallway.
  • Chick Magnet: Played straight when it comes to Ainz, just like in their home series, Albedo and Shalltear show no tact when it comes to express their desire for him, but in this series, Aura and Mare are also shown infatuated with him. Discussed when it comes to Kazuma and Subaru's inner circles being comprised almost fully of women, to the jealousy of the males of Tanya's battalion.
  • Class Clown: Aqua seems to be this to Class 2, since most of the class do not take her claims of being a goddess seriously (for the record she is a Physical God) and tend to look down on her. The fact that she's stupid, unlucky and generally immature doesn't help. Still, this covers the fact that she's one of the more powerful characters in the class.
  • Class Representative: After drawing names, Emilia becomes this to this class with Ainz and Albedo being vice reps.
  • Cliffhanger: The show ends with the group discovering that the way back home was a lie and that they are still stuck in this world. While they decide that they don't mind it that much, Rosswaal reveals that Transfer Students will be joining the class, with the credits rolling when he asks them to enter. The last scene is even more obvious with Rosswaal holding up a sign that reads, "Season 2 coming soon".
  • Clingy Jealous Girl:
    • Like always, Albedo was beyond furious when it looked like Tanya was asking Ainz out.
    • When Albedo rushes out after class to get to Ainz and Tanya's "date", Viktoriya also rushes out to do the same thing, and when she gets there interrupts them to offer to take Tanya to get croquettes.
  • Cloudcuckoolander's Minder: As usual, Kazuma does his damnedest to make sure his party's antics don't publicly embarrass him or get them all killed.
  • The Comically Serious: Cocytus goes along with the crossover's silliness with all the seriousness he packs in his home series.
  • Comically Invincible Hero: Reinhard thanks to his "divine protection" blessing.
  • Commander Contrarian: Aqua will always oppose any idea or suggestion that comes from Ainz, not because of the ideas themselves, but because she refuses to accept anything that comes from an undead.
  • Compelling Voice:
    • Erich von Rerugen shows the ability to give a command that enforces the school rules and for others such as Beatrice and Albedo to be forced to obey whether knowingly or not.
    • Demiurge has his Command Mantra spell from his home series that he attempts to use on Kazuma and Tanya. While it works on Kazuma, Tanya doesn't even recognize its existence and doesn't know why Kazuma can't get up from the floor.
    • Following up with the above entry, Tanya uses her authoritative voice on Kazuma to make him stand up at attention so he doesn't go lie down and they can get actual work done. This puts Demiurge on edge as he recognizes it as something similar to a control spell.
  • Continuity Cameo: The statue Megumin uses as a target for her Explosion spell in Episode 5 is that of Pandora's Actor.
  • Continuity Nod:
    • Episode 5 has Kazuma namedrop the Winter Shogun after Ainz makes it snow, stating that Cocytus resembles it.
    • In Episode 8, it is brought up that Albedo is surprisingly a virgin despite being a succubus.
      • In that same episode, Kazuma questions if she's capable of doing an Erotic Dream like the succubi from his world and it's also brought up once again that Eris and Shalltear pad their chest.
    • In Episode 12, when Chris tells Kazuma that [Steal] doesn't work well due to the characteristics of the new world they are in, Kazuma reminds Chris of how he once stole her panties. He later brings it up again in Episode 16.
  • Contractual Boss Immunity: Discussed in Episode 12 where Kazuma tries to use "Steal" on his opponents, only for it to have completely no effect. Subaru says that since they must be facing the "final boss", one-shot attacks are not going to work.
  • Cringe Comedy: The majority of Episode 5 is this with the characters being forced to participate in a talent show that they didn't really prepare for.
  • Crossover: Between 4 series being licensed by Kadokawa: KonoSuba, Overlord (2012), Re:Zero − Starting Life in Another World, and The Saga of Tanya the Evil.

    D-F 
  • Death from Above: Courtesy of Puck in Episode 10.
  • Death Glare:
    • The members of Nazarick do this to anyone who threatens Ainz physically, such as Aqua, or in Albedo's case anyone who might seduce Ainz.
    • Even when facing Ainz's Despair Aura, a skill that causes the level 100 Guardians of Nazarick to barely maintain their composure, Tanya doesn't even flinch and gives a glare to Ainz that terrifies him enough to trigger his Emotion Suppression.
  • Deer in the Headlights: When Filo and Raphtalia are about to be hit by Mare's wayward baseball speeding towards them, instead of moving out of the way after it hits Naofumi's first and second shields which break indicating the power behind it, they stand still in fear of it hitting them, despite the fact it wouldn't hit them at all if they moved. Of course, there still is the very real possibility that considering Mare's strength, the ball was just way too fast to dodge.
  • Denser and Wackier: Each episode is only around ten minutes and seems to capture only the comedic aspects of each of the series.
  • Didn't See That Coming: Ainz definitely didn't expect that Aqua's Turn Undead, a low level spell according to him, would bypass all his immunities and protections and cause a lot of harm.
    Ainz: A normal Turn Undead from her packs this kind of power?
    • It is very clear that no one, least of all the cast of Konosuba, expected the appearance of the Mobile Fortress Destroyer during the last event of field day.
  • "Do It Yourself" Theme Tune: The opening themes for both seasons are sung by Jun Fukushima (Kazuma), Yuusuke Kobayashi (Subaru), Satoshi Hino (Ainz) and Aoi Yuuki (Tanya). The ending theme for the first season is sung by Sora Amamiya (Aqua), Rie Takahashi (Emilia), Yumi Hara (Albedo) and Yuuki again (Tanya), while that for the second season is by Takahashi again (Megumin), Inori Minase (Rem), Sumire Uesaka (Shalltear) and Saori Hayami (Viktoriya).
  • Does Not Like Shoes: Just like before, Filo is barefoot when in her human form.
  • Does This Remind You of Anything?: The school setting of Isekai Quartet almost resembles a mental health rehabilitation center at times, giving simple assignments and duties to patients while encouraging them to build friendships among each other. The main characters of the four light novel franchises (Kazuma Satou, Ainz Ooal Gown, Tanya von Degurechaff, Subaru Natsuki) have all been through various degrees of extreme hardship that could drive most people insane, making the Isekai Quartet world something of a respite from their unusual lives. Given Japan's general social stigma against therapy, the school setting is a way to give the characters much-needed mental recovery while allowing them to retain their public dignity.
    • Kazuma was the Only Sane Man of his group and also rather lazy. As a result, his patience often wore out and he was less successful than most isekai heroes. Isekai Quartet gives him a somewhat easier, but more structured, lifestyle so that he may gradually learn patience while forming friendships with others outside his own circle, who each have their own dysfunctional personality flaws. When Tanya disciplines Kazuma in Episode 10, this can be seen as hardline therapy sometimes used for "problem" patients.
    • Ainz has been Slowly Slipping Into Evil partly because of the Nazarick NPCs and his undead body, despite benevolent intentions. Isekai Quartet gives him the opportunity for self-reflection, friendship with others from Earth and a chance to distance himself somewhat from the Nazarick denizens, who gradually form their own friendships with members of other casts. Ainz's discovery of Aqua's ability to harm him in Episode 2 could be seen as a downplayed Humble Pie moment, bringing down his pride after being considered invincible on his own world. This is taken a step further when he sees that Aqua, Subaru and Tanya are all immune to his Time Stop, a 10th tier spell that few people in own world could cast. These events allow him to see the other people of Isekai Quartet as more like equals, which is often considered necessary to facilitate real-life mental rehabilitation. It's also worth noting that Ainz was never able to finish middle school where he came from, so this could be seen as an opportunity to complete his education.
    • Tanya's life was one of war and hardship, in addition to being constantly hounded by a deity who seeks to break her mind. Of the four main heroes, Tanya was the most lonely because she trusted no one with her true origins, had no real friends and had no life outside her military duties. Isekai Quartet gives her a much-needed break while also giving her the opportunity to befriend others from modern-day Japan, most notably Ainz. Tanya is also able to establish a rapport with Demiurge, who could rival her in cunning, resourcefulness and sheer evil. As a further benefit, Tanya is now also able to eat modern-era food again, considerably improving her morale.
    • Subaru has lived a life of near-constant failure, embarrassment and especially violent death, making him something of an emotional wreck who just manages to carry on through sheer determination and hope. Isekai Quartet gives him a peaceful life unhindered by his past and the chance to befriend those who don't know or care about his life in Re: Zero. Thanks to the No-Harm Requirement of Isekai Quartet, Subaru can truly relax for the first time in a long while, much like how a Shell-Shocked Veteran slowly heals from PTSD in a therapy group.
  • The Dreaded:
    • A Played for Laughs example is Tanya, who has the entire Youjo Senki cast terrified of her and when truly angry has frightened Ainz and Aqua who are stronger than her.
    • Episode 15 reveals that Kyouhuko is in charge of detention and like his home series everyone is horrified and disgusted, even Darkness.
  • Dumbass Has a Point: Aqua, who is still as ditzy and lacking in sense in this show as she is in her home series, attacks Ainz and his underlings on the basis that they are as evil as their appearances would suggest. As fans of Overlord can attest to, this line of reasoning couldn't be closer to the truth.
  • Effortless Amazonian Lift: In Episode 4, both Rem and Darkness were able to run while carrying Subaru and Kazuma, respectively, without slowing down, and using a single arm to hold them.
  • Entertainingly Wrong: When Aqua confronts Subaru, Ainz and Tanya about being from Earth, she explains she can tell due to being a goddess that summoned Kazuma from Earthnote  to fight the Demon King. Tanya then loses it and tries to attack Aqua, believing her to be Being X due her own experience with a god-like being reincarnating her in another world.
  • Equipment Upgrade: Before being transported to the High School, Tanya was in the middle of testing out an upgraded model of the Elenium Type-95 developed by Schugel. It doesn't seem like it disappeared when she transported. She uses it to watch over Kazuma's Training from Hell and during the Cavalry Battle, to fly above the Destroyer and steal its headband.
  • Even Evil Has Standards: Even the villain protagonists of Overlord and The Saga of Tanya the Evil are disturbed by Darkness's... proclivities.
  • Everyone Has Standards:
    • Aqua might not like Albedo for being a succubus but even she won't make fun of Albedo for being a virgin because she's saving herself for the person she loves. Season 2 reveals that while she's not fond of having Albedo lead the defense against the revived Destroyer she's willing to let it slide due to the situation.
    • Much like in her home series, the depths of Darkness's masochism disgusts the people around her, including clear-cut bad guys, in this case being Ainz, Tanya, and their respective cohorts.
    • However, Season 2 showcases that even Darkness has her limits, being outright disturbed and horrified at the results of some of her classmates being sent to detention and immediately tries to figure out a way to decrease their sentence.
  • Evil Laugh: Tanya is clearly having the time of her life watching Kazuma run around like a headless chicken as he runs away from Puck's magical blasts.
  • Evolving Credits: To coincide with Betelgeuse being added to the show in Season 2 Episode 5, he is added to the opening sequence (being placed right next to Vanir in the scene showing off the minor characters). Likewise, to match up with Wiz being added in Season 2 Episode 7, she is added to the opening sequence.
  • Exact Words: Roswaal told the characters that, if they won the Field Day, maybe they would be able to return home.
  • Excited Title! Two-Part Episode Name!: Though only the first part ends in exclamation point.
  • Eye Awaken: In The Stinger for Episode 18, the eyes of the Destroyer, which was thought to be destroyed at the end of the first season, flicker on once again.
  • Eye Catch: While generally averted, Episode 5, which puts a lot of focus on the Konosuba characters, uses the Eye Catch from that series (with the characters shouting "Ise-Quar!" instead of "Konosuba!")
  • Fantastic Racism: Like in her home series, Aqua is instantly hostile towards Ainz and his group just because most of them are undead.
  • Final Death: Chris informs Aqua, Kazuma and Darkness that they aren't able to revive in this world. Subaru, eavesdropping, wonders if it includes his "Return by Death". He quickly discovers that, even if "Return by Death" can't bring him back, the penalty for trying to tell others still works, so he still can't talk about it.
  • Five-Second Foreshadowing: After Ainz uses Time Stop, you will notice Aqua doesn't turn grey like everything else.
  • Foil: Each main protagonist of the four series in this crossover can be considered one to each other:
    • Tanya and Ainz: Each formerly being a Salaryman - something that is usually common when it comes to the average isekai - and both are currently Invincible Villain Protagonists in their current lives - something uncommon in an isekai. However, Tanya, the supremely successful salaryman who was The Sociopath even in her first life, was reincarnated into an realistic world that happened to be filled with Military Mages during its Great War while Ainz, the average salaryman, was transported into an RPG-Mechanics Verse full all of the typical traits in your Standard Fantasy Setting except he's the typical Monster Lord that now has a Emotion Suppression thanks to his undead body. Also, after being killed by a disgruntled employee he just fired, Tanya was Gender Bent into an cute, little blonde girl who is more often than not the Ignored Expert to the officers she serves under. Ainz, on the other hand, was transformed into an Elder Lich who now is the Evil Overlord and Benevolent Boss to the monsters that worship and follow his every word.
    • Kazuma and Subaru: Both teenagers that are the kind of NEET you would see transported into Heroic Fantasy of a stereotypical Light Novel with a fondess for wearing tracksuits in the new world they are in and both have been brought Back from the Dead multiple times in each of their own stories. However, Kazuma, who stars in a Deconstructive Parody, has been able to find his footing there well enough in the new world he's been sent to and, for all of his faults, tends to come across as The Reliable One of his group. Meanwhile, Subaru, who serves as an Darker and Edgier Deconstructed Character Archetype, has been subjected to A LOT of physical, mental, emotional, and psychological pain that made him actually grow greatly as a person.
    • Subaru and Tanya: Subaru was an unproductive and introverted Hikikomori in life before he was transported to the Kingdom of Lugnica, failing to adapt to his situation quickly enough and got himself killed early on in the story. Tanya was an accomplished and high-ranking HR manager before her reincarnation, very quickly rising through the ranks of The Empire she was born-again into despite being so young. Subaru is an All-Loving Hero who often displays self-loathing at how little he himself can accomplish, while Tanya, someone seemingly incapable of showing empathy towards the people around her, is a Narcissist that often wants to showcase her superiority over others.
    • Kazuma and Ainz: As mentioned below in the Not So Different section, both are the most Genre Savvy when it comes to being Trapped in Another World and both are Beleaguered Bosses that are constantly putting a lid on the extreme antics of their respective groups, which involves putting up with the downsides of having an Unwanted Harem. However, Kazuma is a rather pathetic human being that nonetheless steps up to the plate when necessary, especially when his group's incompetency rears its ugly head more often than not, constantly doing his best to rein them in. Ainz, an extremely powerful lich in his setting, on the other hand, finds himself more and more falling in line with his subordinates' line of thinking as time goes on.
    • Tanya and Kazuma: The two died in accidents involving vehicles, have to deal with a deity that annoys them (Being X and Aqua, respectively), and despite their respective eccentricities, both are quite effective as The Leader to their respective groups, displaying great efficiency at maximizing the strengths of their own teams and weaknesses of any foe they face. However, Kazuma is the very definition of Brilliant, but Lazy who finds himself constantly hindered by his party's insistence on being so damn insufferable to work with or even tolerate on a daily basis. Tanya, who goes out of her way to make sure she's irreplaceable, does NOT tolerate insubordination at all; having put the fear of god in the battalion she precedes over, resulting in her subordinates being as devoted to her as they are scared of her. Also, while both have left an negative impression with the gods mentioned before, the god that Tanya met has become more negative and antagonistic towards her, while the god Kazuma met softens up to him quite a bit.
    • Ainz and Subaru: Ainz is an evolved undead who greatly excels in using death magic, while Subaru is just an average human being whose most notable magical ability is coming Back from the Dead. Ainz, who is arguably the most powerful person in his world, more often than not Feigns Intelligence and ultimately ends up being the Spanner in the Works to the plans crafted around him without even knowing it due to being so overpowered compared to everyone else. As the weakest guy around in his setting, Subaru approaches and overcomes the obstacles before him as The Chessmaster; having been Taught by Experience and gaining the social and emotional skills worthy of entering Magnificent Bastardhood. You can see the difference between first hand in how they respectively first reacted to Tanya in Unstoppable Rage about Being X: Ainz despite being magnitudes more powerful than her is intimidated by her rage twice and only kept his cool because of his Emotion Suppression. In comparison, Subaru besides his revival powers is a regular person but was able to keep his cool when faced with Tanya who exploded in rage in Episode 9 that far surpassed the rage she showed Ainz in Episode 4.
    • With the arrival of Naofumi Iwatani aka the Shield Hero, he can also be stated and treated as being a foil to the titular quartet:
      • Ainz: Satoru Suzuki (Ainz's pre-Isekai identity) was an avid MMORPG player, while Naofumi was a casual gamer who preferred light novels. Ainz begins in his world as one of the most powerful beings there, while Naofumi begins as even weaker than he was in real life. However, while Ainz remains at his power level for most of the story, Naofumi grows at a quick pace through his own efforts. Ainz is always surrounded by loyal minions who obey his wishes, while Naofumi begins alone, having been betrayed by the first person he put his trust in and then the first person to truly help him without any ulterior motives is a slave. Ainz is Slowly Slipping Into Evil because of his minions' influence, but Naofumi, even after using his Wrath Shield, remains firmly on the side of good. Finally, while both of them have the attention of two females, Ainz can tell that Albedo and Shalltear are into him but refuses any advances due to seeing them as his own children, while Naofumi is just blatantly Oblivious to Love. On a humorous note, Naofumi is a college student who uses his intelligence to survive when the Melromarc Kingdom refused to give him any support. Meanwhile, Ainz has to constantly fake-out in order to make himself what he appears to be in order to get by, and is a middle school drop-out.
      • Kazuma: Both of them were summoned to their respective worlds to fight a great evil (the Devil King and the Waves), but Kazuma was implied to be one of many, while Naofumi is only one of four. They are both Deconstructions of the Stock Light-Novel Hero, but while Kazuma is a Deconstructive Parody, Naofumi is a full and straight forward Deconstructed Character Archetype. They are The Leader in their respective parties, but while Kazuma does it because he's The Reliable One, Naofumi does it because of his status as the Shield Hero and because his party members are his slaves. Both of their parties are formed only by females, but while Kazuma is beset by their Crippling Overspecialization and their incompetence, Raphtalia and Filo synergize well with Naofumi by covering each others' weaknesses. Kazuma is Brilliant, but Lazy, preferring to do as little work as possible, while Naofumi works his ass off because he knows his life depends on it. Both have roles that are derided by other adventurers for being the (alleged) weakest of the lot, only for them to prove their strengths, Kazuma by making good use of his Jack-of-All-Trades status and Naofumi by using all of his non-combat skills and mastering all of his shields.
      • Subaru: Both of them are suddenly sent to another world while doing everyday actions and find themselves out of depth in their new worlds. Both suffer in the beginning (Subaru because he was Wrong Genre Savvy, Naofumi because he was falsely accused of a crime), but overcome that through perseverance while still suffering mental problems (PTSD for Subaru, paranoia for Naofumi). Subaru's only special power is "Return from Death", which revives him at a certain checkpoint, while Naofumi has multiple abilities thanks to his Legendary Shield. Both need the help of others in combat, but while Subaru needs it because he doesn't have any special skill beyond his Save Scumming, Naofumi needs it because he is a Stone Wall with a low fighting ability. Subaru devotes himself to helping a young girl that saved him once, but Naofumi loses his trust in women due to Malty's False Rape Accusation (until Raphtalia gains his trust after the duel with Motoyasu). Subaru gains a comfortable place to work thanks to Roswaal, but Naofumi must survive by becoming a trader and itinerant doctor.
      • Tanya: Both were thrown from their lives in Japan to worlds at war and were given the moniker of Devil due to their enemies, (Tanya because of the actions she took during the Great War, Naofumi due to the religion of the country he was thrown into). Both of them hate the individual that took them from their lives, but while Tanya cannot act against Being X, Naofumi gets his piece of revenge on Aultcray by saving him from execution through a thorough application of Cruel Mercy. Tanya becomes a cog in the war machine of her new country, resulting in becoming The Face for her fatherland's propaganda and war efforts, while Naofumi has to act as an independent hero due to his reputation being ruined by Malicious Slander. Both quickly gain the respect and loyalty of those they lead, but while Tanya does it by making them fear her, Naofumi does it by earning their love. Tanya seems to be unable to empathize with others and only cares for her own well-being, Naofumi initially gives that impression but is more than willing to show compassion to others truly in need.
    • Albedo, Viktoriya, Aqua, Emilia, and Raphtalia (the main female characters of their respective series) are all foils to each other. The five are closer to their protagonists than any other member of their respective casts, but their impacts vary wildly:
      • With Ainz, Albedo is more of an enabler, allowing him to see the humans outside of Nazarick as beneath them. Her loyalty is without question because in her eyes Ainz is a living God who can do no wrong. Her interest in him borders on obsessive and while she would very much like a Relationship Upgrade, so long as Ainz is a Lich and sees her as his child, it won't happen.
      • Viktoriya is often around Tanya, but her actions do little to change the Major's mindset or her objectives. She trusts Tanya and is grateful to her leadership, but she projects onto Tanya an image of a stern leader who cares for her troops, while the truth is much different. Though she knows Tanya better than most, she is still blinded by her loyalty and this projection to the Major's true personality.
      • Despite being apart of his journey from the very start and knowing about him before he was transported into another world, Aqua's relationship with Kazuma has the least romantic undertones on both ends as the two are more Like Brother and Sister in regards to their dynamic due to Aqua being the most Not So Different to him. However, Aqua also comes across as more of a liability than the others in regards to her actually aiding Kazuma on his ventures due to having such a Crippling Overspecialization.
      • Subaru most definitely has let his feelings towards Emilia known, but is definitely one-sided. Emilia is also Locked Out of the Loop the most when in comes to Subaru's abilities and experiences, but does truly appreciate Subaru for who he is and what he has to offer despite the flaws he demonstrates throughout their time together.
      • While Raphtalia sees Naofumi as a hero, she has matured enough to see the broken man Naofumi has become in his time in her world and he counts on her to have his back and keep him grounded. Finally, while she would also like to be something more to Naofumi, he doesn't, acknowledging that she is not a child, but still is utterly unable to see her advances as anything other than a childish crush.
    • Episode 15 has Vanir and Demiurge which shows the differences between the two of them despite being devils. Vanir is a trollish Noble Demon that doesn't want to hurt anyone and happily left the Demon Lord he was serving for his own goal while Demiurge is a straight-laced sadist who lives to serve Ainz.
  • Foreshadowing:
    • That scene in the opening where Tanya kicks an exhausted Kazuma as they are running? That was signalling the Training from Hell she puts him through after he declared his intentions to be The Load on field day.
    • What seemed like just a voiceless cameo by Ristarte in episode 8 of season 2 turned out to be this for episode 11 when she and Seiya visit the school festival. Or rather, Ristarte expresses the desire to, but Seiya refusing due to not knowing anything about it.
    • The second season foreshadows several things in the upcoming season of Re:Zero. For instance, in episode ten Rosswaal writes on the chalkboard "Rabbits: what do they eat?" This is a reference to a literal Killer Rabbit that causes a lot of bloodshed in the coming Re:Zero second season.
  • Four-Philosophy Ensemble: The four main isekai protagonists, as much as they are in character here from their respective series, cover the moral spectrum quite well based off their personality traits and actions:
  • Four-Temperament Ensemble:
    • Subaru is Sanguine — the loud, compassionate immortal who tries his best regardless of the situation.
    • Tanya is Choleric — the irritable, task-oriented worker, infuriated by the foolishness of those around her.
    • Kazuma is Melancholic — the most grounded and introspective member of the isekai members.
    • Ainz is Phlegmatic — the least emotional yet most observant and ambitious of the lot.
  • Freudian Excuse Is No Excuse: Played for Laughs. After Tanya's explosive loss of temper, most of her troops are left reeling, with Warren having passed out again. She chastises them for lacking mental discipline, before Subaru points out that they simply know how scary she is. She concedes to this, then yells that it's no excuse and kicks Warren awake anyway.
  • Friendless Background: Even on another completely different world in addition to having three other casts of characters around her, Yunyun STILL has no friends. The second opening even has Yunyun sitting alone away from everyone else in the few seconds we see her.
  • The Friend Nobody Likes: Ten episodes in, while several members of the Overlord, Youjo Senki, and Re:Zero casts have been able to form friendships with one another, the main cast of Konosuba clearly haven't made any real progress at bonding with the others and at times, barely seem to be even tolerated. Aqua constantly antagonizes the cast of Overlord for being undead and is treated like something of a joke by everyone else, Megumin has been largely Out of Focus, and Darkness's masochism clearly repulses and disgusts just about everyone. Out of everyone though, it's Kazuma who probably has the worst relationship out of everyone. His budding friendship with Subaru collapsed immediately when he grew jealous of Subaru's situation (and him not being aware of how awful Subaru's life is in Re:Zero). He's genuinely terrified of his fellow Discipline Committee members, Demiurge and Tanya, the latter turning into a Drill Sergeant Nasty to get him to comply. And when offered the chance to return to his world, he was the only person in the class who outright refused, which resulted in him being punished by being put into a Training from Hell. However, Tanya ends up liking Kazuma after acknowledging his helpful skills and, shall we say: "Usefulness on the field".

    G-N 
  • Gainaxing: Rem has this more often, though it's hard to notice. However in Episode 9, Darkness in a bikini shows off her "impressive push-ups" (to the men of Tanya's unit's awe, Darkness' delight, Cocytus's discomfort, and Ram and Viktoriya's disgust).
    Cocytus: (Sweat Drop) "What should I be doing here?"
  • Graduation for Everyone: Inverted for Ainz. Apparently, he never even graduated Middle School in his former life, which makes him extremely worried when taking a test. This is due to the fact that the Earth he came from is ruled by oppressive megacorporations that purposefully made school expensive to keep everyone dumb.
  • Green-Eyed Monster: Kazuma becomes one for Subaru of all people when they talk about their situations in Episode 4. Because Subaru left out all the horrible suffering and deaths he suffered in adventures, it just sounded like he lives in a mansion surrounded by cute girls.
  • Grumpy Bear: Naofumi whenever he interacts with non-Shield Hero characters, usually forced to, is noticeably annoyed by their antics.
  • Goddamn Bats: In-universe. During the final round of the Field Day, Vanir and Pandora's Actor use their magic to create countless minions, which then form their own quartets to fight against Class 1 & 2.
    Vanir: (laughing) This must be quite a nuisance for you.
  • Hate at First Sight: As expected, Aqua instantly hates the Overlord cast for being undead and demons. She even attacks them in Episode 2.
  • High School A.U.: Could be considered this, since it features all involved parties attending high school, even if some of them are grown adults. Also, it is a very rare official High School A.U..
  • Hypocrite: While Subaru did leave out the reason his life is so hard, Kazuma of all people knows that just because someone lives in a mansion and has a party full of girls does not mean their life is all that great. What makes this especially egregious is that Kazuma has been accused of the same thing in his series.
    • That being said, Subaru himself gets a moment.
    Subaru: Combat Maids? That's too much.
    Ainz: I don't want to hear that from the guy with the Demon Maids.
  • Hypocritical Humor: Ainz finds the level of Reinhard's brokeness to be absolutely absurd, and this is a complaint coming from someone who is himself a invokedGod-Mode Sue in his own world.
  • Idiot Hair: Played for Laughs during the School Physical, as Wiz is unable to measure Tanya's and Filo's height due to how springy their cowlicks are.
  • I Have No Son!: Played for Laughs. Despite being Pandora's Actor's creator, Ainz continuously denies being his father no matter the former's insistence on calling him such.
  • I Need to Go Iron My Dog: In Episode 12, class 1 decides to fight the teachers instead of The Mobile Fortress Destroyer leaving it to class 2/the main protagonists. Subaru complains that they have the far harder task and asks why class 1 doesn't do it when they have Reinhardt. Reinhardt just says his divine protection of not stealing the screentime prevents him from doing this which Subaru once again calls bull on.
  • I Resemble That Remark!: Lupusregina Beta mocks Narberal Gamma by saying she is too violent to act in a The Ugly Duckling play. Narberal Gamma promptly slaps her in the face while asking who she is calling violent.
  • I'll Pretend I Didn't Hear That: When the class schemes to get Kazuma, Aqua, Grantz, Koenig, and Neumann out of detention, Ram implies that Roswaal is also in on the plan, but chose not to pay heed to it until Megumin blows up a bunsen burner and causes a flood.
  • Immediate Self-Contradiction: In Episode 13, Darkness stops a ball with her body. She says it feels great, only for the pain to be too much and her to collapse and say it is not so great.
  • Innocently Insensitive: Downplayed in Episode 8 as Aqua unintentionally insulted Shalltear when she was intentionally insulting Eris for padding her bra.
  • Insistent Terminology:
    • Ram keeps calling Subaru, Barusu. This eventually causes confusion for Serebryakov in Episode 9.
    • Pandora's Actor refers to Ainz as his father due to being personally created by him.
  • Interspecies Friendship:
    • In Episode 3, Albedonote  and Remnote  befriend one another.
    • Downplayed In Episode 4, as while Tanyanote  becomes friends with Ainznote , Ainz is a former human that been placed into his game avatar, so really it is a normal friendship between two humans.
    • In Episode 6, Tanya also becomes friends with Demiurgenote .
    • In Episode 7, Beatricenote  becomes close with Marenote .
  • Ironic Echo Cut: Ainz comments that only a kid or a simpleton would press a suspicious red button that appeared out of nowhere. Cut to the Konosuba group, where Kazuma is holding back Aqua from pressing the button, only for Megumin to press it instead.
  • Jerk with a Heart of Gold: Naofumi is usually dour and annoyed whenever he interacts with non-Shield Hero characters but shows his softer side with Raphtalia and Filo.
  • Kimodameshi: It was discussed in Episode 8 and happens in Episode 9 but most of the characters aren't impressed, with the Youjo Senki cast even saying they find Tanya far scarier than anything in the test of courage. They're proven correct when Tanya enters Unstoppable Rage and causes a Mass "Oh, Crap!" among the entire cast.
  • Large Ham: Episode 11 has a glorious team-up of the four series' resident large hams of Roswaal, Vanir, Pandora's Actor .... and Rerugen as the teacher group for field day.
    • Episode 6 of season 2 has the main cast ham it up in a game of Dodgeball.
  • The Leader: Each of the four main protagonists are this to their respective character groups, in keeping with their roles in their home series.
  • Leaning on the Fourth Wall: In Episode 4, Kazuma and Subaru complain that in Isekai stories, the main character is overpowered, wins all his fights easily, and has a harem of beautiful girls, and how their experiences are nothing like that.
  • Lethal Joke Character: Par the course for Aqua. She is an idiotic Butt-Monkey, yet she is the first character to harm Ainz, and likely would have killed him if Kazuma hadn't dragged her off. In season 2, she also lands the hit that defeats the Destroyer.
  • Let's Get Dangerous!: An enraged Aqua equips her hagoromo in the final episode of season 2 when dealing the final blow to the Destroyer.
  • Lighter and Softer: Is much, much more lighthearted and soft when it comes to tone and content in regards to three of the series featured in this crossover. This kind of setting, however, is par for the course when it comes to Konosuba. That being said, not even the Konosuba portion escapes this trope: Darkness' masochistic fantasies are tamer and less explicit...until she gets more focus in 5 and 6 and goes wild with it, Kazuma's perverted side is pretty much unaddressed until the Beach Episode, as well as Aqua's alcoholism.
  • The Load:
    • Hilariously invoked and deconstructed by Kazuma. He makes it clear that he is very content with staying in the current world and planned on doing nothing on field day, regardless of how much of a Jerkass he looks like deliberately hindering everyone's chances in going back home. This is taken further by the fact that Tanya refuses to have ANY of this laziness hinder the class as a whole and immediately proceeds to put Kazuma through a Training from Hell in order to beat this attitude out of him. And it works as he does try his best on the field day.
    • Episode 14 has Kazuma all but declare Aqua to be this when she tags along with his, Koenig, Neumann, and Warren's scheme to steal wine from the principal's office. Sure enough, her terrible luck causes the mission to go south very quickly. In Episode 23, Kazuma muses that the characters going off to fight the Destroyer should be fine, provided Aqua does not do anything stupid.
  • Loads and Loads of Characters: Inevitable, given that it's a crossover between four series. Just the protagonists and the female leads form a group of eight and it goes past twenty if we include the rest of the main characters.
  • Loads and Loads of Rules: Tanya and Demiurge decide that their first official action on the Disciplinary Committee is to create a list of as many rules for the class to use as possible, deciding the more the better. This is part of what leads to their Odd Friendship.
    Tanya: Rules! Rules first, then freedom. That's how it's going to be!
  • Love at First Sight: Discussed in Episode 3. Albedo uses this as an excuse to be preemptively jealous of any girl (or anyone, if her comments about "age, race and gender don't matter" is any indication) that gets close to Ainz, with Rem agreeing with her, using her own crush on Subaru as an example. This became the foundation of their Odd Friendship.
  • Ma'am Shock: Koenig and Neumann aren't particularly pleased when Filo calls them "old guys", likely having trouble pronouncing their names.
  • Man of Kryptonite: The goddess Aqua most definitely qualifies, as she is one of the very few characters to seriously hurt the undead Ainz and the first and only character to render the vampire Shalltear completely unconscious in one go (though we don't see the actual spell hit her, implying either splash damage or her being scared half to death by how unexpectedly powerful the spell is). Season 2 reveals as a goddess she's immune to his Time Stop, a 10th tier magic.
  • Magical Incantation: Kazuma reveals to Tanya that Megumin probably doesn't need to use a chant for Explosion, since every time she casts it the chant is different. Megumin refuses to shorten or remove her chant despite Tanya's insistence and annoyance, who is training her to maximise her efficiency with Explosion.
  • Mass "Oh, Crap!":
    • When Tanya briefly goes into a Unstoppable Rage, the explosion of power she unleashes is likened to an earthquake, as well as pegged as greater than an 8th Tier Spell by Ainz, and causes several of the cast to go catatonic or to put everyone else in the greatest concerns. It causes the Floor Guardians to be put on edge, and even Roswaal loses his perpetual smile in the shock.
    • Everyone, but most notably the Konosuba cast give another one when the Teachers reveal and activate the Mobile Fortress Destroyer.
  • Massive Multiplayer Crossover: A rare example done for comedy.
  • Megaton Punch: In the final episode of season 2 Aqua finishes off the weakened Destroyer with a God Blow that launches the Destroyer into the sky where it blows up.
  • Mirthless Laughter: Ainz and Subaru indulge in this together while standing next to each other awkwardly during the OP.
  • Mistaken for Badass: Like in his home series, it happened to Ainz again. While Ainz is very powerful, he's just a regular person, making it hilarious that Tanya thinks he's Being X, a god, due to his imposing presence and aura, all the while ignoring Aqua, a real goddessnote .
  • Mood Whiplash: Albedo goes from burning with anger upon seeing Tanya wanting to speak with Ainz in private (thinking she wants to seduce him) to holding hands with Rem and sweetly declaring how well they're going to get along when the latter agreed with her about Love at First Sight.
    • In Episode 10, one scene has Subaru learn the hard way that the penalty for talking about Return by Death is very much still in effect (complete with the infamous "Call of the Witch" BGM)...then immediately returns to comedy as he, Ainz and Tanya nearly get stampeded by Hamsuke and a Death Knight.
  • Mundanization: Four isekai protagonists, all originally from Japan, are whisked away from their colorful fantasy lands and taken to a brand-new world where they must.... attend a Japanese high school.
  • Mundane Utility: Ainz uses Time Stop, one of the strongest magic spells in Overlord canon, to cheat on a test.
  • Murder Is the Best Solution: When trying to figuring out what's going on, Albedo suggests Ainz to kill everybody else, though he thankfully turns said suggestion down.
  • My Friends... and Zoidberg: Meta-wise, while all four works are Isekai series produced by Kadokawa, Konosuba stands out amidst the other three for several reasons:
    • While the other three works are dramatic with hints of comedy that play with standard Isekai tropes to an extent, Konosuba is a parody of the Isekai genre that frequently deconstructs the tropes in the genre with a large focus on comedy.
    • While the other three works all have comparatively large casts of at least six characters with numerous supporting characters appearing, Konosuba only has four main characters, with four supporting characters and a minor character appearing so far.note 
    • While the other three works have largely managed to form inter-class friendships with other works, Konosuba's cast is largely The Friend Nobody Likes, due to their eccentricities putting many of the other characters off or annoying them, in particular Aqua's overzealous attempts to purify the Overlord class.
    • While the other three works all have characters highly skilled in their own worlds, typically in high positions of power, the cast of Konosuba are run of the mill adventurers struggling to get by, with an extreme party imbalance.
  • My Significance Sense Is Tingling: During the fight with the Destroyer at the end of Season 2, Albedo immediately knows when Shalltear is talking smack behind her back.
  • Nerves of Steel:
    • Tanya, eleven-years-old at this point of her second life, stares down Lord Ainz without a hint of hesitancy or fear.
    • Ainz notes that Subaru, a seemingly ordinary human, witnessed an explosion of magical aura from Tanya right in front of him but didn't faint and remained standing, even when several others got knocked out or surprised. He ponders what mental stress Subaru must be used to living under to handle such power.
  • New Job as the Plot Demands: The Ruffian from Konosuba has shown up in the background with a different job each time. It gets ridiculous in season 2 episode 8 when the cast gets part-time jobs in different places and he's somehow all of their bosses and apparently works in the school too.
  • Nice Guy: Subaru, as portrayed here, is the one who's already gone through his big Character Development from his own series, so while he still has a tendency to act like a Large Ham, he's considerably more chill and laid back than he was at the start of Re:Zero. Even his crush on Emilia is more downplayed and healthy.
  • Nice Girl: Emilia's most defining trait in the series, to the extent that a number of other characters have commented on it.
  • No Good Deed Goes Unpunished: In Episode 5, when it's Darkness' turn in the talent show she asks for help. Warren volunteers and due to Darkness being ... Darkness, it makes the entire class think he's assaulting her, calling him scum as a result. Subaru steps up to tell Warren off...only for him to fall victim to the same misunderstanding as well.
  • No-Harm Requirement: How Demiurge interpreted the rules Roswaal stated. Thinking that anything that would hinder their school life is prohibited and as punishment, they wouldn't be able to return to their respective homeworlds. Based on Roswaal's smile when Demiurge explained, it's probably accurate.
  • No-Sell:
    • Tanya seems to have some form of immunity to powers from the Overlord cast. Not only was she unfazed by Ainz's Despair Aura passive, but she didn't even notice Demiurge's Command Mantra and got confused as to why Kazuma was suddenly on the floor. And when Ainz tried to cheat on a test using Time Stop, a 10th Tiernote  spell, Tanya was one of the individuals that were immune to the spell.
    • Subaru himself could maintain his footing and consciousness against Tanya's rage-burst of magical power, of which Ainz notes to be stronger than an 8th Tier Spell from Yggdrasil, due to all the mental stress he's used to in his home series. And, as referenced in Tanya's entry above, he was also one of the individuals immune to Ainz's 10th Tier Time Stop spell.
    • Reinhard's Divine Protection, which lets him no-sell just about anything, most notably shown to be able to completely nullify Kazuma's Steal.
    • Due to Aqua being a Physical God, she turns out to be immune to Ainz's Despair Aura as well as his Time Stop. Tanya and Subaru are also similarly immune to the latter, the former because Being X also halts time in the same way to converse with her, and the latter because his curse functions by rewinding time.
  • Not Me This Time: Season 2 episode 10 reveals that the Destroyer reviving was not Roswaal's doing and something is messing with the world.
  • Not So Above It All: Naofumi does not want to get involved with Class 2's karaage shenanigans, but when called on to do so he immediately uses his Wrath Shield, much to the consternation of Raphtalia.
  • Not So Different: Kazuma and Ainz are both Genre Savvy characters who understand the trappings of the Isekai genre, and such both come to the exact same conclusion when Tanya and her company make their introductions, the difference being that Kazuma mutters his observation out loud and Ainz internally narrates it as in his home series.
    Kazuma/Ainz: Uwah...They're from some war world.
    • Both characters later easily discern Naofumi's personality and characteristics solely from Raphtalia's description of him.
  • Not What It Looks Like: In Episode 5, Darkness tried to show off her durability in the talent show...by having someone whip her. Warren volunteered to help without knowing what he was getting into but due to how Darkness worded it, it made it sound like Warren regularly whipped women which made the entire cast call him trash. Subaru was later dragged into it when he attempted to call Warren out.
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    O-Y 
  • Oblivious to Love: Subaru is madly in love with Emilia, who sees him as nothing more than a good friend. At the same time, he is aware Rem's feelings and support for him, but has already turned her down, not that it stops her from trying to win him over. It's taken to a hilarious point when Emilia gives Subaru chocolate for Valentine's Day, making him immensely happy, with Subaru probably not knowing they were "duty chocolate". At the same time, he is completely unaware of the huge Valentine chocolate that Rem is giving him.
  • Odd Friendship: Considering the large and varied cast, it should not be surprising to see a few of these crop up among them.
    • Albedo takes a liking to Rem when she shares her belief in love regardless of how long you've known a person.
    • Tanya and Ainz become good friends after discovering they were both former salarymen from Japan, having a private talk where they shared interests and experiences of their first life, and just generally feeling at ease at having someone to talk to about this. Tanya enjoyed the talk so much that she left smiling up into the next morning. When Ainz was worried about taking a test (which he didn't know how to answer) and caught Tanya looking at him, he bemoaned and felt hurt about how highly Tanya respects him.
      Erich: That demon who wears the skin of a girl, smiling? What's going on?
    • Tanya and Demiurge develop a bond with one another when selected as members of the Disciplinary Committee not only due to their mutual liking and respect of Ainz, but also because they agree that the classroom needs a detailed structure and list of rules first before anything else. They develop such a respect for each other that after stopping Kazuma from peeking on the girls in swimsuits, they end up ignoring Kazuma due to constantly praising each other and being humble about praise from the other person.
      Kazuma: (Aside Glance) These two make a crazy pair.
    • It becomes inverted with Kazuma and Subaru however. Although they initially took great joy in finding one another, once they explained their respective situations, Kazuma becomes enraged and declares Subaru his enemy after discovering that not only does he live in a mansion, but he's also surrounded by beautiful girls, two of which are maids and one of whom has feelings for him, gets to go after the girl he loves, and all the while declaring his life hard which Kazuma can't comprehend. To be fair to Subaru, he can't explain why his life is hard lest the person who hears it dies.
      Kazuma: "You Harem-having bastard!"
    • Beatrice becomes less cold to Mare when they're both Librarians, saying there is something relaxing about Mare. She also insists on accompanying him to school when they meet up, all in her usual Tsundere way.
    • Felt and Chris are shown to be friends in Episode 16 because they were thieves but if you know their backgrounds, they're completely different. Felt is a lost princess who hates the wealthy due to growing up poor and became a thief to survive while Chris is actually the goddess Eris who due to being a goddess of fortune has made her world very capitalist and is a thief as a way to relax from her goddess' responsibilities.
    • Megumin and Pandora's Actor... though they're less of an Odd Friendship and more of a friendship that was completely inevitable. When they first interact face-to-face, Pandora's Actor spends most of the conversation admiring Megumin, and Megumin acts prideful and plays up her Chuunibyou persona, before acting star-struck when Pandora's Actor starts speaking German. It eventually leads to Megumin declaring Ainz worthy to be her Rival, as Pandora believes Ainz has the same interests as him and told Megumin as much.
    • Megumin and Emilia both seem to get along very well despite their very different personalities. It's likely due to the fact that they have the same voice.
  • Oh, Crap!: Ainz is shocked and horrified in equal measure when he discovers there are people capable of moving during the activation of his Time Stop which is a 10th Tier spell.
  • The One Thing I Don't Hate About You: Albedo claims that Valentine's Day is "the one holiday foolish humans celebrate that [she] approve[s] of".
  • Only Sane Man: Naofumi, along with Raphtalia and Filo by extension, are the only ones who aren't comically exaggerated in the series.
  • Pet the Dog: Despite showing nothing but contempt for the Overlord cast, Aqua jumped to Albedo's defense when Shalltear was mocking her for being a virgin succubus, going on a rather uplifting speech about how there's nothing wrong with saving yourself for the right person.
  • Phantom Zone: The world of Isekai Quartet is most likely this, since events within will have no effect and no mention on the cast's further adventures when they are finally able to return to their respective worlds.
  • Picky Eater: Tanya. Disliking most of the German-style food from her world, she enjoys the chance to eat modern Japanese cuisine again.
  • Power Creep, Power Seep:
    • Parodied in Episode 2, with Ainz noting that Aqua is a goddess capable of hurting him, one of the most powerful beings in his series, with a low-level spell and yet was easily Dope Slapped into submission by Kazuma with zero fanfare due to their world being an Affectionate Parody instead of a serious one like his.note 
    Ainz: A goddess who can make me feel pain even at level 100. And a human who casually punches such a goddess. This world...has some serious power balance issues!
    • Ainz has another such moment in Episode 16 when he uses his Time Stop spell to try and cheat on the test, only to discover that Aqua, Tanya, and Subaru turn out to be completely immune to it. note  Naturally, this experience visibly unnerves him, as Time Stop is an 10th tier spell that almost no one in his world can use, and he is prompted to quickly dispel it before any of the unaffected individuals learn that he was the one casting the spell all along.
    Ainz: In my world, barely anyone can even use Level 10 magic! But it doesn't work on all these people? This world's really scary!
  • Precision F-Strike: Kazuma gets one in the dubbed version of Episode 11 when the Mobile Fortress Destroyer shows up.
    Kazuma: Not the f***ing Destroyer!
  • Puni Plush: The series uses a more limited "chibi" style than the more fleshed out art style of the four series, reminiscent of Studio Pyukai's previous Re:PETIT, Starting Break Time From Zero, Ple-Ple-Pleiades and Youjo Shenki skits. Save for maybe Konosuba, these might also count as New Work, Recycled Graphics.
  • Running Gag: Yunyun being the only seen member of Class 3 keeps popping up.
  • Serious Business: Several characters take what sort of topping goes best on karaage so seriously, that a dodgeball game to settle the matter is called. To wit, highly destructive magic attacks are permitted to be used in said game. It even goes with the sides some characters pick: Cocytus choses Salt (as opposed the rest of the Floor Guardians, who choose Ketchup since it was what Ainz chose) and it causes him no small amount of distress, shaking constantly and insisting he isn't disloyal; meanwhile, when somebody points out that Rem would choose to be in the same team as Subaru, she admits that normally it would be the case, but with this topic, she can't betray her convictions.
  • Shared Universe: Suggested, Aqua figures and points out that Tanya, Ainz and Subaru all come from Japan just like Kazuma, implying they all hail from the same world.note 
  • Shout-Out:
  • Slap-on-the-Wrist Nuke: Megumin gets trained by Tanya to refine her Explosion, in order to focus the damage to a single point while minimising unnecessary collateral.
  • Slasher Smile: Tanya gives quite the deadly one towards Kazuma before and during his Training from Hell.
  • Smitten Teenage Girl: Rem for Subaru, no matter what he does she finds amazing.
  • Sneeze Cut:
    • After dealing with Beatrice, Rerugen says that he shouldn't underestimate little girls, since he knows some demons who "wear the skins of little girls". Cue Tanya sneezing.
    • After going through the Test of Courage, both Viktoriya and Weiss mention that their world was scarier, though Weiss specifically mentions that Tanya is scarier. Viktoriya admonishes him, worried about Tanya, and both accuse the other of being the one who said it. Again, cue Tanya sneezing.
  • Spoiler Opening: Pay attention to the Karaoke tracking shot in the opening for the show's second season; if a character shows up there who has not been featured in the show yet, chances are they will play a part in that episode, both Wiz from Konosuba and Betelgeuse from Re:Zero appeared in this shot in their debut episode.
  • Spot the Thread: When confronted in private by Tanya and she mistakes him for Being X, Ainz deduces from the details she spouts that she is actually from Earth. One can actually see the moment when he figures it out.
  • Spotlight-Stealing Squad: Defied in the climax. When given the option to face the teachers or The Mobile Fortress Destroyer, the Class 1 team quickly chooses to go against the former. Subaru protests that Class 1 should have fought the much stronger opponent since Reinhardt is on the team. Reinhardt unhelpfully mentions that his divine gift prevents him from "stealing the spotlight", much to Subaru's dismay.
  • The Stinger: The one in Season 2 Episode 8 shows that the special menu button has reactivated the Destroyer.
  • Stronger Than They Look:
    • Aqua as always. Despite being a narcissistic, whiny idiot most of the time she's still a goddess as Ainz realized when her Turn Undead, which he stated was a weak spell, seriously hurt him. Aqua could legitimately solo a good chunk of the Tomb of Nazarick, considering Ainz's forces are comprised of mostly undead or evil monsters. And as shown in Season 2, she is also immune to Ainz's Time Stop 10th Tier spell.
    • Tanya, surprisingly. Not only was she unaffected by Ainz's Despair Auranote  and didn't even notice Demiurge's Command Mantranote , but when she got angry at Aqua, she released an aura of magical power that was likened to an earthquake and noted by Ainz to have the power to exceed that of an 8th Tier Spell by Yggdrasil's standards. When Ainz tried to cheat on a test using Time Stop, a 10th Tier Spell, she was completely immuned to that as well. And likewise when she able to block a magical dodgeball that was fuelled and had the combined properties of Ainz's "Nuclear Blast" and Megumin's "Explosion" with a magic barrier powered by Being X's Blessing, though the ball broke before she had to fully endure the attack.
    • Rem as well, as she was able to restrain Albedo and Shalltear, two Level 100 Floor Guardians of Nazarick with Shalltear being the strongest Floor Guardian, with no visible strain or difficulty.
  • Sweet Tooth: Weiss and Viktoriya have opposing feelings for Valentine's day because they both love chocolate, Weiss is happy that he can get some while Viktoriya is sad she has to give them away. Based on Weiss' statements, their reactions is because the war has cut production of chocolate so they haven't had it in years.
  • A Taste of Their Own Medicine: In Episode 8, Shalltear opts to embarrass Albedo by revealing to Kazuma and Aqua that Albedo is a virgin succubus. However, this causes Aqua to go on a rant about how one shouldn't be ashamed of saving themselves for the one they love, or anything else for that matter, then adds an exception for padding one's chest (specifically referring to her fellow goddess Eris but unknowingly catching Shalltear in the crossfire), resulting in Shalltear herself being humiliated instead of Albedo (much to the latter's mirth).
  • Teacher's Pet: Ram is this to Roswaal in Class 2, particularly when she tells on Kazuma for his plan to steal "the red stuff" from the principal's office. It's taken Up to Eleven since Ram's love for Roswaal is carried over from their original world.
  • Tempting Fate: Ainz dimisses Aqua's Turn Undead as harmless since it's a low level spell he should be immune to. It procedes to cause him severe pain.
  • There's No Place Like Home: Despite the fact that this place could be seen as heaven to some, all of the groups are still looking for a way to get back to their own worlds.
  • This Is Gonna Suck:
    • Once the cast of Re:Zero enters the class, Kazuma utters this.
    • Tanya has this reaction when Rerugen says he will perform the Empire's anthem for the talent show.
  • Time-Freeze Trolling Spree: After Ainz freezes time to try and cheat on the test, Aqua, one of the other people who are unaffected by it, goes on one of these. To wit, before she is noticed by Tanya, she shifts Kazuma's posture so she can peek at his test and shoves pencils up his nose, and also shifts Roswaal out of his chair.
  • Time Stands Still: Ainz tries to use the Level 10 Time Stop spell to cheat on a test. However, Aqua, Tanya, and Subaru are all unaffected by it, which forces him to remain still to avoid their attention and letting them deal with each other before he ends the spell.
  • Too Kinky to Torture: Averted with Darkness, for once! Even she was disturbed after seeing what Aqua, Kazuma, Koenig, Neumann, and Warren were like after a single detention with Kyouhukou.
  • Took a Level in Kindness: Subaru and Tanya, in comparison to their home series, are considerably nicer. In Subaru's case, he has joined the show post-character development, so he's now a more mature person than he was at the start of Re:Zero. For Tanya, now that she's been removed from her war-torn, Crapsack World, she's a lot more mellow.
  • Trapped in Another World: The main joke of the series is that four Isekai protagonists and their supporting casts have now been subjected to an Isekai inside their own Isekai stories, only this time to a shared comedy setting.
  • Tragic Dropout: This was never addressed in the main manga or anime and is only briefly mentioned in the light novel, but this is what Ainz is. Because of the circumstances of his previous world, he was forced to drop out of middle school, which is why he panicked enough to try and cheat on a test.
  • Training from Hell: When Kazuma makes it clear that he'll be The Load on field day, Tanya decides to "fix" this attitude the 203rd Mage Battalion way. When Tanya tries to bring Aqua into her study curriculum to prepare her for a test, Aqua very politely refuses. Twice.
  • Troll: On Valentine's Day, Weiss asks Kazuma to give him advice on how to get chocolate from girls. Kazuma's advice is to bow and start yelling "Give me Choco" until the girls eventually relents. The other members of Tanya's battalion can tell that Kazuma is obviously lying to him, but Weiss takes his advice at face value, to disastrous results when he tries it on Rem.
  • Twincest: The final episode of season 2 has Ram and Rem, who are playing Cinderella and her prince, respectively, sharing a kiss.
  • Underestimating Badassery: Ainz is dismissive of Aqua (understandably), seeing her Turn Undead attack as low level...and in the process of being hit by said attack, Ainz is screaming in genuine pain. This legitimately causes an Oh, Crap! reaction amongst Team Overlord when they realize how dangerous Aqua is.
  • Unsettling Gender Reveal: Mare finally reveals that he's a boy to the shock of Megumin, Warren and Beatrice in Episode 9.
  • Unstoppable Force Meets Immovable Object: The Sports Festival of Episode 11 hypes up the potential duel between Ainz and Reinhardt, the World's Best Warriors of their respective Universes. The fight ends up not happening because the teachers enter the contests.
  • Unstoppable Rage: Anytime Tanya thinks she finds Being X, she explodes in rage. After learning that Aqua is a goddess, she unleashes enough magic power to horrify her squad and even unsettle the Overlord cast.
  • Valentine's Day Episodes: Season 2 Episode 5 is about Valentine's day, focused on the boys expecting to get chocolate from the girls, and the girls deciding who they want to give their chocolate to. The episode itself was specifically planned to air on the week of Valentine's Day.
  • Villainous Friendship: Both Tayna and Demiurge hit it off almost immediately due to their Control Freak natures.
  • Villain Respect:
    • Subaru earns one from Ainz after standing before and calming down a pissed off Tanya, who unleashed a spell that outranks a YGGDRASSIL 8th Tier spell, and also powerful enough to unnerve even the Floor Guardians. He secretly wonders what kind mental stress he's living under to shrug off such Unstoppable Rage.
    • After witnessing Kazuma's competence and great luck firsthand, Tanya voices that she'd make him apart of her battalion if they were back on her world, which is a lot coming from her.
    • After Aqua demonstrates that she could hurt Ainz with a classic Turn Undead spell, she is taken seriously by the Nazarick denizens as a genuine threat, which is notable since they are all extremely powerful creatures who look down on most people. Ironically, they are among the few beings who respect Aqua, if grudgingly, since she is normally considered a simple fool by most people, even on her own world. Also, appropriately enough for her poor luck, Aqua only has the respect of those she considers her enemies in the world of Isekai Quartet.
    • Somewhat downplayed, but Emilia gets one from Rerugen who considers her to be a kind and gentle angel, unlike Tanya.
    • During the season 2 climax as the main heroines keep the Destroyer mech away from the school festival, Albedo comments that Viktoriya is rather strong for a human.
  • Violently Protective Girlfriend: Well, minus the "girlfriend" part; when Rem heard about Hamusuke chewing on Subaru's head, her response was to whip out her flail and shout "let's defeat this monster together!"
  • Visual Pun: When Albedo uses her spell "Wall of Jericho", she performs the Walls of Jericho (as in, the wrestling move) on Gantz to do it.
  • Vitriolic Best Buds: By season 2 Warren and Megumin have been seen hanging out after being made in charge of the intercom in episode 6. Most of the time Warren is snarking at Megumin's Chuunibyou tastes.
  • Wacky Homeroom: It goes without saying, given that the students in this classroom are a perverted shut-in, a sociopathic little girl, a lich, twin oni maids, a depraved succubus, a Chuunibyou obsessed with explosions, and a masochistic crusader, among others.
  • Walking Spoiler: The Destroyer form KonoSuba, who serves as the Final Boss of both seasons one and two. It's first faced by the main leads in season one, then followed by the female leads in season two.
  • Wham Line: The first season ends with one.
    Roswaal: By the way, I forgot about something important. Transfer students will be joining the class!
  • Wham Shot:
    • After hearing that no one is able to revive after being killed, Subaru decides to test the theory by attempting to tell Tanya about his curse. To his horrified disappointment, the penalty of telling anyone about Return by Death is still very much in effect.
    • Seiya and Ristarte showing up in episode 11 of season 2.
  • What Does This Button Do?: When Kazuma's group finds the button, Aqua wants to press it despite Kazuma warning her it might be dangerous. While he's holding her back, Megumin presses it.
  • Wrong Context Magic: Reinhard's divine protection. Thanks to this blessing, he can practically No-Sell everything and everyone that is sent his way. This is best shown when Kazuma's Steal ability had no effect whatsoever.
  • Yes-Man: Most of Neumann's dialogue in Episode 14 is "Yup".
  • You Are Better Than You Think You Are: Megumin actually dismisses people who believe Kazuma will use Steal to cheat on the test, saying that he is very intelligent and can pass by just taking it normally, a comment that genuinely touched Kazuma and made him softly smile with a small blush at the praise as well as acting bashful when Tanya commented on Megumin's remark. Tanya's praise just embarrasses him as he was planning on cheating off of Tanya, but it also pushes him to pass the exam without cheating.


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