A lot of Ken and Shinjiro's bickering ends up being this. One example would be Ken becoming indignant that Shinjiro insists on coming to Tokyo with Ken, protesting that he's not a child. Shinjiro retorts that he's pouting. At Ken's retort that he's not, Minako just laughs and coos over how cute Ken is.
During the first meeting of Ken and Ren, Ken notices Morgana and asks why Ren has Morgana in his schoolbag at school. Ren ends up claiming that Morgana is his therapy cat. Ends up being a Brick Joke, with Ken pointing out Ren's excuse after the Phantom Thieves confront Ken for being in Kaneshiro's Palace.
Ken describing Ryuji jumping out in front of the taxi as giving him a heart attack.
Ken's reaction to Morgana talking. As Ken didn't have his cognition changed so that Morgana can talk by the time he first met Ren and Morgana, he could only hear Morgana meowing before.
Ken's narration: It was the cat. The cat was talking. Why was it talking? How was that even possible? Was this a delayed symptom from hitting his head yesterday? Was he hallucinating? Okay, Teddie-san usually walked around as a plush bear, but he had a human form. Somewhat. He was pretty sure that a human would not be popping out of the cat. Did this mean if they brought Koromaru to the Metaverse, Koromaru would start talking? Would he take on a cartoonish form? It was weird, thinking about it.
Ken ends up being caught by the Phantom Thieves when he was trailing them in Kaneshiro's Palace. Ryuji becomes furious and starts chasing him. Naturally, Ken just runs away. Poor Morgana and Ann trying to play damage control.
The Phantom Thieves confront Ken, after the defeat of Kaneshiro, since he accidentally unveils himself. After things have cleared up a little... Ryuji asks if Ken is compensating for something, with his Weapon of Choice. Ken is very much unamused about Ryuji's question.
The Phantom Thieves converse about recruiting Ken. Morgana is against this, but Ryuji just teases him about the therapy cat lie. When Morgana denies it, Ren proceeds to tease that Morgana doesn't like the fact that Ken seems to be a dog person.
Ren: Well... we could always ask him to join us. The Phantom Thieves:[stare at Ren] Ren: Hear me out. He's experienced. He helped save our butts when we fought Kaneshiro. And you have to agree that from what you've seen he's nice enough, isn't he? Plus he does agree for what we fight for. Makoto:[chuckles] I honestly had the same thought about Ken. Ryuji: I think you're just bitter about the lie Ren fed him to explain why Ren was carrying you with him. Morgana: That is not true! He's suspicious! Ren: Or maybe you don't like that Amada-senpai seems to be a dog person. Morgana: T-That is not true! And why should I care about that?!
The Phantom Thieves find out that Ken knows Yukari Takeba. Ryuji is flummoxed especially and goes on to say that he finds Yukari hot. Ken is a bit grossed out, and Ryuji demands if Ken has eyes. Ken responds by saying that Yukari is like an older sister to him.
Ken's annoyance with Akechi during their first meeting. He goes on to complain about how arrogant Akechi is in his narration. Akechi also challenges Ken on his thoughts on the Phantom Thieves, leading to this conversation.
Ken: You've made it perfectly clear that you think that the Phantom Thieves are nothing more than criminals themselves on your various interviews. You don't have to repeat it. Akechi: Oh? And I suppose you believe that the Phantom Thieves are better than law enforcers? Ken: They get things done at least. While you've been running off giving who knows how many interviews.
Ken hears Ryuji's nickname for Ren, much to his surprise. Ren then teases Ken that the nickname happens to work for him as well. Ken very firmly rejects the idea.
The discussion of Ken's codename. Ryuji proceeds to stare at Ken, before declaring that Ken looks like Tuxedo Mask, much to his embarrassment. Ann declares his look to be princely, which embarrasses him even more. But there's also the names that the Phantom Thieves throw out before they settle on Ace.
Ryuji: Let's do Tux Boy. Ken: Uh, no. Not in a billion years and not even if you paid me ten million yen. Yusuke: Kamen? Your costume does inspire it. Ken's narration: Kamen that was like Kamen Rider Wait, what was he thinking?! Yusuke was thinking about Tuxedo Mask and that was just embarrassing to think about. Ken: No. Morgana: Jeez, you're a picky one. Ken: I'm not going to be called something ridiculous.
Yusuke asks if Ren has an idea for Ken's codename, remarking that Ren suggested both Fox and Queen. Ann just grumbles that they weren't there for picking out her name, and Ren reveals that he suggested Sexy Kitty for Ann. Ken gets even more concerned at learning this.
Ken asks Ren why the Phantom Thieves operate in the day. Ren is confused, and Ken asks him what other phantom thieves do. Ren starts talking about how they leave a calling card, steal something of value... And then Ken asks when exactly they strike. Ren then sheepishly points the blame at Morgana.
Ren: Uh It was Morgana's idea? Morgana: HEY! You can really ruin your health by staying up too late! Don't tell me that you stay up late to study or something! Ken: Okay, I won't tell you then.
The fact that Sae starts being suspicious of Ken and Makoto due to the fact that Makoto calls him by his first name.
In a chapter after, Sae and Shinjiro meet and she proceeds to question him on Ken. Shinjiro just brushes her off, just walking away at one point.
Shinjiro and Sae's relationship in general. It's very antagonistic and Shinjiro mentions that Sae reminds him of teen!Mitsuru, comparing her to a prissy princess. Shinjiro just does not tolerate Sae's attitude and refuses to be cowed by her.
Ken gives Shinjiro his mother's old engagement ring, much to his bafflement. He includes a note and ends it with this:
Ken: (Also if you try to give the ring back to me, I'm just going to toss it into the trash bin. So don't even think about it.)
Ann witnesses one of Ren and Makoto's fake dates, and she assumes that they're now dating. However, she feels that they should be open about their relationship, despite having realized her feelings for Ren. So during the meeting right before they were going to steal Futaba's Treasure, she tries to get them to admit it, much to their confusion. Ken gets annoyed, having told Ren to make a move with Ann already. While Ann is trying to process this, Ryuji can no longer take it anymore and shoves Ann at Ren.
Ann: Look, I know you guys are dating, okay?! Makoto: What? Wait, Anne, we're not this is just a misunderstanding! Ann: Don't lie to me, Makoto! I saw you two at the diner! I don't know why you're trying to deny it! You're so, so lucky, okay?! Ren will treat you like a queen. He's so kind and thoughtful and he'll probably come up with the best dates and-
Ann's narration: Did Makoto know how lucky she was ? Ken: This is why I told you to ask Anne out already. Do you need any more proof now?! Ann: Wha? Ryuji: EFF THIS I CAN'T TAKE IT ANYMORE!
Ken calls Shinjiro and Fuuka for Shinjiro's birthday. He carefully alludes to what he gave Shinjiro's birthday. Fuuka, however, questions him what the gift was. Shinjiro blurts out that it was a Korean cookbook. Fuuka buys the lie, but then blithely tells Shinjiro that they should pick a recipe and cook something.
Futaba's fangirling over Yukari. After Yukari signs her DVD set, Ren describes Futaba holding it like it was the Holy Grail itself.
Shinjiro has many witty one-liners, being rather blunt. One example is when the Phantom Thieves run into Sugimura. Sugimura recognizes him as a cohort of Mitsuru and insults him for it. But Shinjiro has a comeback ready for him...
Sugimura: You're you're one of Kirijo's dogs. Shinjiro: And you're a little bitch.
In Hawaii, Ken and Makoto catch Ren and Ann leaving Ren's hotel room together. Makoto automatically jumps to conclusions and demands an explanation. After Ann sheepishly explains, Ken points out that Ann could've gone to the front desk or one of the chaperones for help. But afterwards... Ken has a little chat with Ren. He states that he doesn't care if Ren and Ann sleep together, just that they use protection. Ken then hints that he walked in on either Minato and Yukari or Akihiko and Minako being intimate years ago.
After much griping about Ken teasing Shinjiro about his and Fuuka's PDA, Shinjiro ends up walking in on Ken and Makoto's first kiss. He ends up asking Mitsuru to get her scientists to invent Brain Bleach. This may be shaping into a running gag, as Shinjiro has been shown to walk in on Ken and Makoto a second time not long after they start dating.
In the flashback with the 5-year-old Ken and Akechi, Ken mentions playing with a young Makoto. Akechi is repulsed, asking about cooties. Ken just shrugs it off and says that Makoto was nice. Akechi then demands to know if he likes her. Ken then scoffs at the idea, asking why he would ever want to kiss her.
Persona Q2: The Ace Edition
When it's pointed out that the Mona-bus has surpassed its capacity, Ren has a simple solution: lap sitting.
Kaito and Miyuki are very... candid. One example would be when they argue over what Akechi's mask resembles.
The fact that Kaito and Miyuki know the word "execution", due to Mitsuru's execution threats.
Ren hamming it up during the final confrontation with Kamoshidaman.
While the main story takes place in 2016, this fic throws in a shoutout to Fire Emblem: Three Houses. The cast is discussing why Ken's Persona is still Kala-Nemi over Nemesis (though Minako is understandably confused on why Ken's Persona is different.) However, it's portrayed as the twins' imaginations running wild instead of a blatant reference to the Fire Emblem game.
Miyuki: Nemesis sounds like a bad guy's name, anyways. Like a zombie level of a bad guy.
Kaito: Oh! Oh! And he has glowing red eyes, gray skin and he wields a creepy magic bone sword!
Miyuki: That the bad guys brought back to life to sic on the good guys!
Ken: Has Junpei-san been letting you watch inappropriate movies again?
Kaito outs Naoto by protesting that P4!Naoto can't be Naoto, because the Naoto he knows doesn't bind her chest. This understandably mortifies Naoto, and Ken ends up having to scold him for being so blunt.