In Night of Knives, Slayer narrates how two Robo-Ky's met each other. The two of them argues which one is the original and had a mallet smacking contest. The two of them hid in a cave to avoid rust and agreed to become allies. After another argument, RK 1 ran off to the rain and RK 2 chases it and calls it an idiot for making it worry. However, RK 2 encountered the "dame-original" (Ky Kiske) who attacks it with Ride the Lighting. When RK 2 thought that it died it realized that RK 1 took the hit for him.
The scene turns into a sad one in which RK 2 grieves over the loss of RK 1 (although it’s more about the loss of RK 1’s data) while Ky looks on such a pitiful scene. RK 2 calls him a murderer, Ky apologizes and tries to put his friend back together, but it appears sad (funny) and just plain pointless. RK 1 says that “that’s enough idiot”…to RK 2…making this even more pitiful. The last things on it’s “breath” are an insult before entering final sleep mode.(Blade's Summary)
In Accent Core. He hits on every female character he encounters(except May because she's "too young") and rejects the repairs offered to him by Crow.
(To Baiken): THOSE BREASTS... THEY'RE TOO PERFECT!
(Against Dizzy): ALTHOUGH SHE'S NOT HUMAN AND HAS TWO WEIRD THINGS COMING OUT HER BACK, SHE'S PERFECT!
(To Crow): YOU FAIL AS HUMAN!
His reply to Crow when he was told that Ky escaped (after bragging his win over the original.)
Zappa's 2nd ending in Accent Core where his illness was "cured" by Faust. The doctor found out that Zappa's handsome face was that one that attracted the ghost S-Ko, so to exorcise him, Faust gave him a nasty plastic surgery that made his face look like Picasso's painting.
Dizzy's 1st ending in Accent Core where she is telling Johnny to finish his meal fast so she could go to Ky's place for their investigative sessions. Johnny, having noticed her fondness of him asks her if everything's going well with him(romantically.) Dizzy, as innocent as ever, doesn't understand what Johnny meant and left happily. Johnny, as a worried guardian, mentally told himself that someone like Ky Kiske wouldn't take advantage of Dizzy.
Johnny: (I doubt that chump would do anything anyway...)
This becomes Hilarious in Hindsight when you know that Ky and Dizzy will eventually live together and have an illegitimate child in the future.
Jam's story modes. She spends almost her entire story in Accent Core Plus trying to get people to eat at her restaurant and beating them senseless when they refuse. In one ending, it culminates in her knocking Crow unconscious and dragging him back to her restaurant. There's also Millia and Venom getting into a drunken argument and destroying her restaurant in GGX 2.
Faust's Scalpel Enema attack is prone forcing hilarious reactions from its recipients, but Eddie has most likely taken the crown for the most entertaining and controller-dropping reaction in AC+. His response?
Chipp's story mode in AC+ where he campaigns for his presidency and ends up being "allies" with... assassins! Take note that he has no evil intentions, it's just that he doesn't understand the implications.
Some of Slayer's Quotes shows how loose he is with Sharon...
(Against Self): "Do you really think Sharon would mistake you for me? Ah! Why are you so nervous, Sharon?"
(Against Bridget) "If you master those skills, I'd happily be your patron....Sharon? It's just a figure of speech!"
(Against Axl) " Your looks are deceiving. Is that your secret? Hm? Don't look at Sharon like that!"
Again from Slayer:
(Against Zappa) "Obsession is also a form of love. Of course, you should choose a spouse carefully. Right, Sharon?"
(Against Faust) " I find humans fascinating because someone like you comes along once in a while."
The ending of Overture, where we hear Ky laughing the first time because he sees his younger self at his son.
Don't forget that right after, Ky adressed his son informally and said "the hell." It's the first time Ky mentioned something really out of his character.
This is even funnier in Japanese because Sin is telling Ky to address him with the pronoun omae or temee which are more informal than anata. And out of the two choices, Ky picked temee which is roughly equivalent to him calling his own son "bastard."
Speaking of Faust, his new Instant Kill has him performing surgery on his opponent, for betternote Sol, Potemkin, Milla Rage, Chipp, Zato, Venom, Slayer and Bedman or worsenote Ky, May, I-No, Himself (and possibly the Big Bad herself), all while Ode to Joy is blaring in the background with Faust as the conductor/surgeon.
Venom's instant kill has always been to turn his opponent into a pool ball and take a shot at them. Xrd ramps this up by turning it into a cinematic attack, allowing the player to see exactly what their opponent looks like as a pool ball and their looks of horror (Except Zato is obliviously smiling the entire time since he can't see what's coming).
The end of Potemkin's Instant Kill in Xrd has him smashing his opponent through the ground, causing them to end up on another part of the earth (with a palmtree!)
Chipp's arcade ending, where he defeats Valentine, laments that nobody's actually seen him beat her and gets no credit, can't make heads or tails of Valentine's Magi Babble, then tells Valentine not to underestimate PRESIDENT CHIPP ZANUFF when she insists the Senate's schemes cannot be stopped.