Lelouch's Zanpakuto spirit Eien Tamashi's reaction to him suggesting Screw Yourself after she flatly says You Need to Get Laid (since Zanpakuto spirit are technically a part of a soul reaper.) in Chapter 32.
Eien Tamashi: "I'm a part of you…you jackass!" She then slaps him.
Brought up again much later in Chapter 169, instead of a slap she attacks his inner world.
Right after Lelouch's nightmare about being a Hollow and wants to know what it's about:
Eien Tamashi: Need a second opinion?
Lelouch: Yes I do. Do I want your opinion? No.
Eien Tamashi: Someone woke up on the wrong side of the bed.
Lelouch: I had a really bad dream, not like my reoccurring nightmare, so I'm not in the best of moods. Pardon me if I'm short with you.
Eien Tamashi: Oh well, excuse me your highness.
Rangiku laughs when she finds out Lelouch is a virgin. Eien Tamashi Lelouch's Zanpakuto begins cackling herself despite the fact that she knows that already, much to Lelouch's chagrin
Lelouch: Why are you laughing? You know that already!
Eien Tamashi: I...don't...care!
In chapter 18, Eien Tamashi acts as Yuna's echo just to annoy Lelouch
Chapter 26 Depsite the fact that Lelouch, and the reader, are quite excited about the prospect of Lelouch finding Rukia while Hisana is still alive, Eien Tamashi couldn't care less
Eien Tamashi: "We haven't done training in a while. I'm bored."
In chapter 27 Mayuri forgets he's lost four not three deputy department heads. Lelouch and Nemu kindly remind him of this
Ichigo and his nakama randomly guessing why Fong Shaolin, their teacher, is absent. Ichigo asks Keigo if he's high when Keigo suggests that Soifon is a Yakuza. Orihime almost correctly guesses what Soifon is and Ichigo says that it's actually better than Keigo's thoery.
In chapter 38 Soifon the normally callous and ruthless former executive militia commander acting bubbly and excited because Yoruichi promised her something special if four members of Ichigo's class got in the top 25 of the freshman class
The omakes for chapters 82 and 83 also. Just...yeah.
The 100th omake chapter celebration in all of its glory lol
Chapter 83 has Lulu being called out on his dramatic poses and speeches
Central 46 Member: And captain, do try to keep the theatrics down next time you visit. We find your over dramatization rather annoying.
Eien Tamashi: Haah! Iceburn!
Chapter 106 Omake, where squad 11 discovers hardcore anime and fanfiction.
Ryuken giving Uryu a condom to keep in his wallet.
For the love of peace the condom is quincy themed and Ryuken makes them!
Phoebe attacking Rita and believing that she has her on the ropes cause all Rita is doing is blocking and Rita is wondering in her head what she should have for dinner and the moment she comes out of it, combos Phoebe without even trying
Rita: I wonder what I should have to eat first chance I get to eat the Soul Society cuisine. I'm sort of feeling like Ramen, but maybe I should have sushi. Sushi always tastes better. No, wait maybe some fresh fish. I haven't had fish in a while.
Well, Gin does look and sound like Hazama, so a talent for trolling must come as part of the package...
In the same chapter there's also Rita ordering one of her new servants around and calls him Jenkins. His name is Braekin.
Rita: Jenkins, Braekin. Tomato, Tomahto.”
She also asks what she's paying them for only to get the response of “You don’t.”
Also in chapter 134 we have Stefan just bluntly admitting that he knows about, and may have used, a hole in the partition for the Squad 2 onsen. In front of his Number TwoKendra. Her reaction is priceless.
Kukaku on her period. It might be an obligatory PMS joke intended for a cheap laugh (or at least that's how it comes across), but it is still extremely funny, especially describing shutting the room to the door with her in it as locking a dragon behind it.
Cornelia’s blunt query to Guinevere if she engaged in sexual activity to become Viceroy of Area 14
Chapter 199 has Cornelia chasing after Suzaku all over Soul Society for sleeping with Euphemia and its effect everywhere and Rukia of all people making and winning bets off of Renji and her husband Kaien.
In chapter 200 we find out that not only did Clovis completely puss out during the Hell on Earth, but he was scared of FUCKING DEER! Not even a full grown buck, it was a fawn. Some 5th year academy student he is.
During a particularly heartwarming scene between Lelouch and Nunnally, Eien Tamashi hangs a lampshade that every time someone spends all day with a member of the opposite gender and brings them to Sokyoku Hill to see the sunset it usually winds up in the sideways polka. She also gives a bit of snarkysarcasm.