1. What is one word to shut them up?
Okay, I was seriously struggling to come up with just one word for this, so I’ve done “a phrase” or a “conversation topic”. I hope that’s okay. (Also, I borrowed Twist again. Sorry Kit.)
Papyrus
Puns. Any puns. He might make a loud exclamation of disgust, but more than likely, he’ll go very silent and just glare. (This is true of many of the non-lazy Papyri).
Edge
So much as mention Edge’s LV, and he’ll go become silent and withdrawn (especially if he’s close to the person who brought it up). It’s a particularly sensitive subject if he’s had a bad day (and perhaps even gained some EXP). He doesn’t like talking about it outside of work. He’d prefer to pretend it doesn’t exist.
Stretch
The boy likes to talk, but there is one reliable way to get him to shut up–compliment him. He doesn’t know what to do. He turns into a wide-eyed baby deer in headlights. This is significantly effective if it’s a compliment on his physical appearance. “Nice jeans, Stretch.” ……. O.O
Slim
Honestly, it’s getting Slim to talk that’s the problem. He’s silent most of the time anyway. So, I’m cheating. I’m going to say that the way to get him to actually start talking is to bring up music (yes, I’m totally stealing Kit’s headcanon that Slim likes music. I love it. Piano Boy.). Even if it’s something as simple as his favourite genre or band, he’ll immediately open up if you take an interest.
Cash
His brother. (I have a whole set of headcanons for Cash’s relationship with his brother, but I won’t get into it now, or we’d be here for hours). I’ll just say this–they don’t have a healthy relationship. I wouldn’t go so far as to say they despise each other, but they definitely don’t get along. So when Cash spends time with his friends (or lovers, or enemies) he doesn’t like bringing his brother into the conversation. Avoid topic at all costs.
Twist
(Sorry, I’m stealing Twist for a shitpost moment). “Beans.” No one knows why, but as soon as you say the word “beans” around Twist, he falls completely silent, and won’t speak until you say the word again. It’s his “jinx word”.