Beelzebub provides examples of the following tropes:
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Sadistic Choice: Ringo gives one to Aoi, after taking both her Red Tail gang and Oga actually Beel in Oga's body hostage: either fight one of the Red Tails to get Oga to be released, or fight Oga to free the Red Tails.
Himekawa is ridiculously rich, and firmly believes that Every Man Has His Price. This actually becomes a major plot point in the Behemoth arc where he is able to use his influence to rent out whole office complexes and turn them into gaming rooms.
The San Marx arc revealed that he had actually bought the gaming rooms previously, using the winnings from betting on online gaming matches.
Chapter 151 has Beel fleeing from Chiyo and Futaba's little spat to go cry into Oga's chest.
Oga: What the hell are you doing? You're pathetic.
Izuma bails out of the Best Couple Grand Prix in Chapter 184, due to a combination of Shizuka being eliminated earlier on in the tournament and not wanting to fight Oga.
Himekawa refuses to team up with the other delinquents in order to fight the upstarts, instead preferring to try his luck on his own, and later ditches the gang entirely to join forces with Takamiya.
Secretly Wealthy: Utterly averted with Himekawa, who openly flaunts his wealth at every opportunity. Though it's played straight with Nene, whose family makes enough money to be able to afford a lavish house in a gated community.
Selective Obliviousness: When Tojo is told that he's been fighting against demons, he just agrees that "those guys were strong as demons". He also doesn't question Baby Beel's origins on account of him being cute, nor Akuma Academy's construction since he got paid well for the job.
Sexy Soaked Shirt: Shortly after finding the Demon's Portrait, Himekawa manages to set his hair on fire. Putting it out causes his hair to fall out of his pompadour, causing Furuichi to nickname him 'Sexykawa'.
She's Not My Wife: Oga and Hilda. To the point where when Kazuya called her that neither of them even bothered to correct him.
Pretty much the entire Ishiyama group skip school, either because they're training in the mountains or playing video games against a Demon Lord. Their excuse is that they all had relatives who died. Apart from Aoi, who was hospitalized for acute gastroenteritis.
Aoi: What the hell is that?
And Tōjō, who's always out on one of his part-time jobs during class hours.
Shower Scene: Oga gets one eventually, though it's only from the waist up and is kinda spoiled by the fact that Shiroyama is standing outside the window. In the anime he gets a Furo Scene in the second episode.
Similar Squad: The Field Trip arc introduces one for Ishiyama High. South Chinpira High created their own Tohoshinki modeled after Ishiyama and even have an Oga clone, Izo Aiba, who's just a bit less of a Cloud Cuckoo Lander and just as much of a Bad Ass. The main difference so far? Well, he's blond and falls in Love at First Sight with Kunieda... and his baby sister falls for Beel...at first sight..
Slasher Smile: Oga, oh God, Oga. The faces he makes can be seen as the definition of a slasher smile.
Jabberwock is usually frowning, but gets one of these when he's really enjoying a fight.
Sleep Cute: Hilda snuggled up to Beel in Chapter 139 after getting into bed with Oga.
Chapter 141 gives us one with Hilda and Yolda.
Sleep Mode Size: Koma's goofy little monkey form. His true form is a hulking lion-dog twice the height of a grown man.
Slobs Versus Snobs: Happens when the delinquents transfer from Ishiyama High, the worst Inner City School around, to the much posher St. Ishiyama. It is then taken Up to Eleven when Oga infiltrates the ridiculously wealthy San Marx Private Arts Academy, whose students consist of children of big league politicians and foreign princes.
Smoking Is Cool: Saotome-sensei smokes almost constantly, and is undeniably the most badass character introduced so far.
Arguably Basilisk, with his ever-present cigar and ten foot battleaxe.
Alaindelon/Arandron. However, since the character is named after actual French actor, Alain Delon, Alaindelon is likely the correct romanized spelling of the name. Doesn't help that the official website spells it Arandron though.
Dr. Forkas/Furcas/Folcas Rachmaninoff/Rachmaninorr
Hecados/Hecatos/Hecadoth, Graffel/Graphel/Graphiel, Odonel/O'Donnell, Xoblah/Kusobra, Yshiel/Yuchelle, Labed/Rabid. However considering their names are based on an ancient alphabet, there is an official reference.
Super Senses: Hilda's left eye is revealed to be much more visually sensitive than her right, allowing her to read opponents' moves with ease. She usually keeps it covered though, as the huge sight difference between the two makes her nauseous.
Suplex Finisher: Oga uses this against Tojo during their second fight at Ishiyama and wins.
Surreal Theme Tune: The opening song "Dadada!". It would be impossible to know what was going on at all if the animation wasn't vaguely related to the lyrics.
And now End Theme 4 "Papepipu♪ Papipepu♪ Papepipupo♪". "Grugrugrugrugrugrugrugrugru... DON'T TOUCH ME!" Indeed.
The Symbiote: Baby Beel actually is like this. He needs a human parent in order to channel and develop his powers, while at the same time giving superhuman powers to his host/parent.
Teenage Wasteland: Gangs of teenage thugs roam the streets day and night and the underground network is made up mainly of young people. Ishiyama High takes this to the extreme.
Teleporter Accident: While Doctor Awesome is successfully dropped off at the Demon King's palace, Alaindelon makes a mistake and Lamia, Oga, and Furuichi are instead taken to the wildest, most dangerous area of the Demon World where they are stranded until help comes. And there are monsters everywhere. Huh.
The Chinpa Mooks in Chapter 152 really take the cake.
Chinpa Mook: [to a captured Yuka] We're on a private roof of the penthouse suite! No one's gonna come save you this time! [cut to Himekawa standing right there] Himekawa: What are you people doing on my roof?
There's no way that a toy from the demon world would just conveniently arrive. Right?
In Chapter 184, Kanzaki and Yuka theorize that they'll probably win against Izuma and Aoi so long as they aren't in a head on battle. Guess what their semi-final challenge is.
In Chapter 217, one of Takamiya's spellmasters mentions that the collected power from Beel, which is stored in their power sealing machine, will be trouble for Takamiya should it be released. This sets the stage nicely for Himekawa to break said machine.
Tender Tears: Oga's family are moved to tears several times in the space of one chapter when Hilda loses her memories and begins acting very polite and endearing.
This is Shizuka's MO during her and Tojo's Best Couple Grand Prix match in Chapter 182. It nets her perfect scores from the judges every time.
During the Best Couple Grand Prix, the word Nene has to somehow mime to Furuichi is 'poop'. Cue minor Freak Out.
All the bad guys in the Rice Boy Hero Show are toilet themed names like Baron Von Poop.
Took a Level in Badass: In Chapter 169, Furuichi becomes strong enough to take down the likes of Oga and Miki, thanks to the power given to him by the Demon Lord's tissues. The era of Furuichi has come indeed...
Anyone who receives the King's Crest. So far it's given Kanzaki and Aoi the power to completely turn the tables in their fights against the Upstarts, and boosted Himekawa's levels to the point where he can fight and defeat Tojo.
Akumano Academy too. We're told by En and his supporters that it will be an epic one of these for the Ishiyama students to reclaim their school. Oga decodes to show up the night before and beat almost all of them on his own very quickly (and the others are only needed for one puzzle/lock challenge). It's hilarous.
Toxic Phlebotinum: The tissues which Furuichi uses to summon the power of other demons contain toxins that slowly kill humans. Furuichi begins to experience side-effects in the form of hallucinations. Thankfully seems to not work as poorly the second time he uses them. To be fair, he used less.
Training from Hell: Oga's "training" of Beelzebub in Chapters 39 and 40. To get rid of his fear of bugs.
Grandpa Kunieda forces his students to break rocks with their bare hands as training. And they don't eat until they succeed.
Saotome's training involves jogging round the mountains doing stretches while he chants some weird made-up song about punching people. Subverted as Oga only finds it complete hell because of how stupid it is.
Tojo proudly boasts to one of Takamiya's mooks about how he trained so hard that he vomited blood. Sounds good and all, until you realize that said training was in tennis.
Transferable Memory: The thing that finally convinces the separate parts of Furuichi's soul to be united in a single body is the fact that, if they do so, they'll all be able to view the memory of Nene in a bikini.
Parodied again in Episode 55, which shows an extremely detailed sequence of... Himekawa fixing his hair. Not to mention the way he pulls out his stun baton is a mirror image of how a magical girl would pull out her staff.
Trapped in Another World: When Oga and Furuichi are pulled into the Demon World by Alaindelon. They get back, eventually.
The only thing that can reverse Salamander's memory erasing flames is a kiss from Prince Charming. Salamander lampshades that this is the way problems are solved no matter the era. Hilda's prince is Beelzebub, apparently.
Salamander: The market value will never drop!
As Chapter 176 shows, it's less that the kiss completely cures a person, and more like the kiss just switches the person's personalities around. A pre-memory loss Hilda will switch to her post-memory loss personality if kissed by Baby Beel, and will revert back to her pre-memory loss personality if kissed again.
Trying to Catch Me Fighting Dirty: Furuichi readily admits that the other characters are combat monsters well beyond anything he could compete with. Thus if forced into a conflict, he'd rather run, and barring that will resort to any low-blow or sneak attack necessary for victory. It works pretty ok for him.
The entire Ishiyama High delinquent team using Baby Beel in volley ball. Just barely within the rules thanks to what the Six Knights said before the match.
The female Pillars use underhanded tactics to try and get at Oga, such as flirting with him or pretending to be afraid/innocent. Aoi calls them out for it.
During the cooking duel in Chapter 183, Kanzaki hoards all the ingredients so the Furuichi-Nene pair won't have a chance to cook.
Twin Switch: Although they aren't exactly twins sisters Hilda and Yolda look similar enough to successfully switch places in the Akuma Academy dungeons, which gives Yolda a chance to escape.
Two-Teacher School: Ishiyama High before Oga destroys it is actually a no-teacher school (except for the lunch lady and the principal/janitor). With a delinquency rate of 120%, what do you expect? Lampshaded by Furuichi in the anime.
Furuichi: You know I've been wondering this for a while, but what do the teachers in the school actually do?
Undying Loyalty: Hilda has this towards Baby Beel. It's implied she also felt this way towards his mother, Lady Iris.
The entire concept of a King's Crest revolves around this. Each of the Tohoshinki bear Beel's King's Crest because, no matter how much they would hate to say it to his face, they all see Oga as their boss.
Unknown Rival: Aiba sees Oga as a rival for Aoi's affections. Oga being Oga is not only totally uninterested, but hasn't even realized that Aiba thinks he's this.
Unlimited Wardrobe: When not at school, the cast are always shown wearing different casual clothes, some of which are pretty detailed. The covers also have them in a variety of fancy outfits.
The Unreveal: When Oga gets a video message from the Demon King, he's anticipating the chance to finally see his face. Those hopes are shot down once he actually plays the message, as all he gets is a crotch shot.
Unsympathetic Comedy Protagonist: Oga's redeeming personality traits number in the single figures but his situation is hilarious. Heck, Furuichi, Hilda, and Tojo probably count as well.
Unusual Ears: Some demons have webbed gills in place of ears.
Unwanted Harem: Genre Savvy Furuichi is doing everything in his power to prevent Oga from gaining one because "It just isn't fair".
Unwitting Pawn: Both Oga's gang and the Upstarts are apparently this for the Solomon Company, according to their main agent. It remains to be seen how much of this claim is true, and how much is simply villainous posturing.
Vitriolic Best Buds: Oga and Furuichi would gladly put each other in danger to save themselves, but they're never apart and always end up sticking together. This is reinforced when they fight each other and Oga reveals how much he respects his only friend.
Volleying Insults: The delinquent characters do this all the time, often calling everyone an idiot and ending sentences with things like "you bastard" or "I'll kill you".
Weaksauce Weakness: Himekawa's power halves if his hair isn't in his iconic pompadour, which makes him extremely weak when in his bishounen mode.
Weirdness Censor: Oga's family never seems to comment on why Baby Beel can produce powerful electric shocks when he cries. Or why Oga's room frequently explodes. Or all the weird uninvited guests that keep turning up.
After Tojo got into a fight with a demon, Saotome tried to explain the situation to him. However Tojocompletely misses the point, and persistently just agrees, "yeah, that guy fought like a demon" when Saotome is trying to flat-out tell him "No, he actually was a demon!"
Played with when En has the Akuma Academy built as a base for his forces and they hire Mr. Takahashi, a regular teacher, to teach them about the human world. He does notice the many, many things that are wrong with his "class", but is too freaked out and needs the job too badly to make the necessary mental leap to acknowledge that they're demons.
Western Zodiac: The Solomon Company agents have demons that follow this theme.
Why Do You Keep Changing Jobs?: Tojo. Not entirely his fault, though. Random thugs keep showing up at his workplace to challenge him to a fight - which he never turns down. Naturally, that gets him the pink slip.
Which Baby Beel later reenacts with a stuffed lion while Oga cheers him on.
Also, CHANGED MAN KICK!, CHANGED MAN CLOTHESLINE!, CHANGED MAN ELBOW DROP!, and finally, CHANGED MAN BOSTON CRAB!.
Tojo gets in on the suplex action while taking on Jabberwock.
Yakuza: Kanzaki is related to some. We get to meet them in Chapter 143, and being a son of the boss Kanzaki demands their respect.
You Are Not Alone: Seems averted at first when Oga storms Akuma Academy on his own to try and rescue Hilda. However then it's revealed that he has radio contact with Furuichi and Lamia (and later Himekawa). It's finally played straight after the rest of the school have their Big Damn Heroes moment and chew him out on leaving them behind.
You Gotta Have Blue Hair: Most of the demons have brightly coloured hair, like pink, blue or green. Although it's justified because they're, well, demons, no one in the human world comments on it.
You Have Failed Me: Kanzaki beating up Shiroyama after he lost a fight, before ordering him to jump out a window. Hecadoth and Graphiel are imprisoned after they lose in a fight against humans.
Takamiya loses all importance in the eyes of the Solomon Company after losing against Oga. This causes their agent to attempt to kill him in order to retrieve Lucifer from him.
Youkai: Aoi makes a pact with a Tengu in order to get the power to fight against demons. He's described as a type of demon that came to the human world hundreds of years ago.
Your Mom: In Chapter 224, one of these is the Solomon Company agent's parting shot.
Yo mamma's so stupid she thinks taco bell is a Mexican phone company!
You Must Be Cold: Tojo gives Shizuka his jacket while waiting for Izuma to show up.
You Owe Me: In Chapter 221, Akaboshi and Mammon's help comes with the price of Oga owing them a very big favour. This is lampshaded by Akaboshi.
Akaboshi: I just thought it would be profitable to have you guys indebted to me.
You Shall Not Pass: After Satan invades Ishiyama, Tojo singlehandedly takes on over a hundred guys from Shinkyouku High in order to protect Himekawa's power sealing machine, which is the only thing preventing those in Ishiyama high from being petrified.
In Chapter 235, Akaboshi, Nasubi, and Takamiya band together to prevent Fuji from destroying the second power sealing machine before it has a chance to activate.