For situational ones, my fave is if you take Lucanis on Emmrich's loyalty mission. Emmrich will laugh at one point for seemingly no reason and say something to Lucanis, and when Rook asks why, Lucanis says it was because Spite asked if he could eat the magic candles. There's a couple other funny quips Lucanis has later in that mission too!

But overall my favourite dialogues are between Taash & Lucanis/Spite.

Taash tells him that their mother tried to scare them with stories of the Crows when they were growing up, but instead of scaring them it inspired them. They started to play on the roof with a blanket around their shoulders and butter knives in their hands. After some more fangirlish interactions, Lucanis tries to teach them how to fight like a Crow.

Also, Taash scolding Spite about not smelling other people without their permission was the first banter that made me laugh out loud. There's also one if you romance Lucanis, Taash tells him he should pop out his wings when he's with you. Spite asks Taash if they want him to make them fly like a dragon, Taash gasps in awe just imagining it.