“he would not fucking say that!” then put him in a situation that makes him say it, we wanna see him squirm
It's good old fashioned characterization practice when confronted with "he would not fucking say that" to go "under what circumstances WOULD he say that?" And then go "and how would he get into those circumstances?" And boom. You have a MUCH more solid character.
It's also a fun magic trick as a writer to write a guy so well you get people foaming at the mouth on the comments going "HE WOULD NOT SAY THAT BUT HE *DOES* AND IT *MAKES SENSE* FUCK YOU FUCK YOU FUCK YOU!!!"
This is the core of why I love angst. It’s character algebra. If you want the character to do X, what needs to happen to make it so?















