The very first conversation between the characters and the askers (specifically after Hajime realizes he traveled back in time):
Ask: Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa Hajime: Yeah, that’s me right now. What the hell is this?
The anons in general waste very little time bantering with pretty much every character they meet.
After Gundham's dog makes off with an important piece of equipment Hajime has (which he wants to keep secret), Sonia decides to help by announcing on the school's PA system that she will give a kiss to the person who manages to get the dog, getting a good portion of the student body to join in the chase. Hajime's reaction really sells it, as does just about everything involving the resulting chase.
The story of Umeko's very awkward confession to Setsuka.
While Sonia beating up Kanade was awesome, her reaction to realizing that she yelled out "EAT SHIT, MURDERER!" is pure gold.
Sonia: Ah, haha, well…i-it was a heat of the moment thing?
The morning after Umeko and Setsuka get back together:
Kokoro: Ah, finally reconciled with someone you were close to? Umeko: Yep yep! Kokoro: And you had sex last night? (cue Umeko bluescreening, her soul briefly seen leaving her body) Umeko: ...Pardon me. (walks down the hall and climbs inside an empty locker before closing it) Kokoro: (surprised)It was just a question.
The downside to life as an AI stuck in Akane's head, according to Sora?
Sora's methods of keeping Akane in line? Threatening to expose her search history.
Once Fuyuhiko learns about how only him and Peko are helping deal with the Human Traffickers, an anon points out that he and Peko are the best for the job and then says this:
Anon: I mean what's Teruteru going to do? Hit on them until they get uncomfortable and shoot him? Fuyuhiko: I mean, he could give ‘em food poisoning.
After Junya Utsugi's defeat at the hands of the Quantum Crew, Sora hacks the speakers to broadcast an announcement written by an anon in order to humiliate Junya even further.
Anon: I'VE COME TO MAKE AN ANNOUNCEMENT: JUNYA UTSUGI IS A BITCH-ASS MOTHERFUCKER. HE'S PROSTITUTING HIS WIFE AND FUCKING DAUGHTER! THAT'S RIGHT, HE'S LETTING GROWN-ASS FUCKING MEN RAPE HIS YOUNG DAUGHTER AND SHE ESCAPED AND TOLD ME ABOUT THE HORRIBLE SHIT HE DID TO HER AND I SAID "THAT'S DISGUSTING," AND NOW HE'S PLANNING ON SELLING HER AND OTHER INNOCENT GIRLS OFF AT AN AUCTION ALONGSIDE HAIJI TOWA, AND KIDNAPPED A FEW ULTIMATE STUDENTS SO THAT I DID WHAT HE WANTED, SO I CAME HERE TO FUCK HIS SHIT UP AND HACKED THE NEARBY SPEAKERS TO MAKE THIS CALL-OUT: JUNYA, YOU ARE GOING TO JAIL FOR WHAT YOU'VE DONE, OF BLACKMAIL, HARASSMENT, AND KIDNAPPING ALONGSIDE THE PROSTITUTION AND SEX TRAFFICKING! AND GUESS WHAT? NO ONE IS GOING TO SAVE YOU. THAT'S RIGHT FUCKER, EVERYONE SAW THROUGH YOUR BULLSHIT NEWS REPORT AND SINCE YOU HAVE THE PAY RATE OF A FUCKING DENTIST YOU CAN'T BAIL YOURSELF OUTTA JAIL. HAVE YOU HEARD WHAT MOST PRISONERS DO TO SEX TRAFFICKERS AND PEDOPHILES IN PRISON? IT'S FUCKING BRUTAL IN THERE! HE ENDED HIS YOUNG DAUGHTER'S INNOCENCE, SO GUESS WHAT, I'M ENDING THAT MAN'S WHOLE CAREER ALONGSIDE THE TOWAS, SHINGETSUS, AND OTHERS! EXCEPT I'M NOT JUST GONNA END HIS CAREER, I'M GONNA GO HIGHER; I'M GONNA END HIS PENIS! HOW DO YA LIKE THAT, JUNYA? I'M TAKING SOME STEEL-TIPPED BOOTS AND SWINGING THEM RIGHT INTO YOUR BALL-SACK, YOU IDIOT! THE REST OF JUNYA'S ASSOCIATES ONLY HAVE SO LONG BEFORE I FFFFFFFFFFUCK YOU ALL OVER TOO, NOW GET INTO FUCKING JAIL ALREADY BEFORE I END YOUR GENITALS TOO!
This is topped off by Hiyoko actually using steel-toed boots (that an anon provided her, no less) to kick him in the crotch. Junya's reactions to the rant as well as when Hiyoko rears back to kick him and his scream are hilarious as well as satisfying.
When visiting her mother, Mikako is warned that she wouldn’t believe some of the things she’s seen happen at the school.
Mikako: That’s-wait, what’d I just sit on? Kokoro: Ah. That must be one of Owari-san’s emergency bacon stashes.
During the Mistletoe Arc, one anon admits to wishing he could make Haiji kiss a sewer pipe. Monaca's reply?
While comparing the Sunny Days Resort to Pleasure Island from Pinocchio, Souda worries about the possibility of the teenagers turning into donkeys.
Yoruko: He's a cult leader, not a wizard, Souda-kun.
The repeated jabs at Maverick Storm's awful fashion sense.
Hajime noting that he is more scared of his parents coming home than he is of everything else going on his life.
Iroha challenges Akemi to a Yu-Gi-Oh duel after the latter claims to have gotten better than the former at card games, leading to Nikei wondering how long she'd been carrying them around... only for Akemi to also whip out a deck of Yu-Gi-Oh cards in response to the challenge.
In order to get Iroha to agree to come to the police station with her, Setsuka promises to take her out for ice cream. In spite of being nervous, mainly because she technically kidnapped Jataro, Iroha agrees because she wants to prove she's a big girl, which leads to this exchange.
Setsuka: So you don’t want ice cream? Iroha: …I didn’t say that, I just said…y’know.
Upon seeing Mahiru's father for the first time, many of the Anons admit that he's a lot more attractive than they were expecting and start commenting on it. Mahiru and Hitoshi have very different reactions.
Mahiru: C-Can you please not?!
Hitoshi: Heh, why not? Thank you!
During the Cuddle Puddle's ski trip, Hibiki suddenly falls head-to-toe into a hole covered by snow that, as Hajime points out, isn't that deep. She does not enjoy the reminder about her height.
Meanwhile on the other slope, Hiyoko, Sonia, and, Kotoko are enjoying casual slides down the slope while Mikan tries to conquer her fear of heights.....at a speed literally compared to that of a snails (by Hiyoko's own estimation, she took 2 minutes to finally inch down the slope.) Though the real comedy kicks in when Gundam falls in from nowhere. His explanation?
Gundam: It seems the ice demons had me fooled. I misjudged the distance and direction and was launched high into the sky.
Iroha explains her and her siblings' plight to her mother's old classmates, specifically by singing a variation of The Ballad of Guiteau. Complete with Setsuka and Maku singing along.
fireflamerx9z (An anon): ...You are aware you could have just told the story normally, right? Iroha: Maybe, but where’s the fun in that?
Upon meeting Chiaki's grandmother, some of the protagonists walk in on her trying to burn a spider with a spray can and a lighter. One anon quips to Hajime that Chiaki will end up like that when she gets older. Later, an anon asks Chiaki if she ever saw her grandmother do this around her.
According to Hajime, back in the original timeline, Nagito's mechanical hand suddenly gained a life of its own and went crazy, dragging poor Nagito with it and punching Souda. Sonia even said "Unhand him!" at one point.
The "Bathtub Incident". To explain, Sayaka and her idol group were attempting to help Kyoko in getting rid of a weapons stash she found. Since they were too far from the ocean, they decided to melt the weapons down with acid. It worked for a while...while also melting through the bathtub of their hotel room. Needless to say, the girls are embarrassed by it.
Nekomaru's mother, who is said to later adopt Nikei, is dating Kazuichi's dad. After some anons point out this means the three will probably become stepbrothers, the latter two point out it's only one date. Neko's response?
For that matter, most of the interactions between the three qualify. Mainly their way of handling Nikei's behavior.
During the interviews at Hope's Peak following their exposure, a bored Hajime asks for an update from the anons and gets:
Anon:Your grandpa is hot. Does that count as something? Hajime: No, because you guys said that already. I wish you didn’t.
After the group finally meets Marin in 2030, one of the anons asks an important question:
Anon: So is Marin like...speaking in emoticons? How does that work? Marin: How does what work? (・_・;) Nikei: That? At the end of your sentence? Marin: What do you mean? (*°ｰ°)ﾉ Nikei: There! That one! That…that-that! There’s something at the end of your sentence! Marin:(looking nervous) There is?! ( : ౦ ‸ ౦ : ) Nikei: Do....a-are you not the one doing that? (looking frightened) Then...h-how is it...? Marin: Wait! Quick, does it look like it’s there when Big Sis does this? (smiles) Or this? (ᓀ ᓀ) (bigger smile) Or this? (ノ*°▽°*) Nikei:[beat] ...You were just messing with me, weren’t you? Marin:(winking) Big Sis learned from the best! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧
For Valentine's Day, Nagito and Kanata meet up, and Kanata reveals her gift to him; herself in a bunny suit! She promptly trips over the high heels.
She later admits that she chose the most modest looking outfit; the only other suits that could fit her left much more exposed:
Nagito: Too uncomfortable? Kanata:(relaxed) No, I’m certain I could pull it off, I just didn’t want you to pass out from the sight. Nagito:(shocked) ...Well, someone’s confident!
Hiyoko's Valentines chocolate for Hajime is her attempt at making what the Aztecs made for their chocolate drinks. It's... not good to say the least.
. Complete with Setsuka and Maku singing along.fireflamerx9z (An anon): ...You are aware you could have just told the story normally, right?