Dolly, the Warrior of Love! Magical Punishment is Deserved by the ones who prey on the weak!
Black Frost is one long string of hilarious one liners:
VS Babel's 2nd form: "I-It transformed, ho? Babel turned into a gigantic churro, hee-ho!"
VS Belberith: "It's a meatball! A talking meatball, ho!"
VS Sariel and Anael: It speaks less sense than me, ho! It's got wings and attitude! Punishment time, ho!
Upon trying to help the demons Black Frost is protecting from some demon tamers, Midori tries to convince him to just destroy the comps. Just before agreeing, Midori accidentally gets his Verbal Ticrubbed on her.
Midori: No ho, er...no!
Black Frost's reply to Midori's plea to not hurt the demon tamers is equally priceless:
Black Frost: Ho? But they're hee-horrible! I can't magical punishment them, ho?
At one point, it is revealed that Amane fought off a demon long before demons could be as readily summoned as the COMPs allow. When Atsuro asks you how that could be possible, you can respond: "because Amane's a total badass!"
Once Atsuro tries to deny that you can't do that, the MC changes from his smirking battle pose to his sad out-of-battle pose.
During the last day, on most routes, just before the Very Definitely Final Dungeon, the protagonists get all pumped...only to wear themselves out by climbing the 53-floor building of the place. The only ones who don't complain are Midori and Naoya.
When you're trying to save Kaido from the SDF, he tells them to leave him alone. The Hero has a second choice to say "But we LOVE you!"
If you agree at first to accept Naoya's big plan during his route on the evening of Day 6, a startled Yuzu asks you if you're sure. If you choose to think some more on it, Naoya says: "...Damn it, [[name]]. Women will be the death of you. I'll be waiting for you here."
When asked if one of the Devas was enshrined in Omotesando, choosing the incorrect answer makes Amane correct the answer. Cue Atsuro congratulating the protagonist for not making him look bad, and the protagonist looking sad for failing afterwards.
Right after defeating all the Devas in Gin's route, Atsuro asks the protagonist if there's something they need to do first before heading for Roppongi. A second choice to choose is "Bathroom break". If you REALLY choose it, Atsuro scolds the protagonist to hurry up.
One that's only present in Overclocked, made even funnier by the fact that Overclocked is voice-acted and Honda says it in such a cheerful and matter-of-fact way:
Honda (having just saved the party from being taken in as terrorists by the SDF): Hello, terrorists. Looks like you were in a pinch there. Try to be more careful next time.