One of my favorite things to headcanon for some reason is how/how much characters cuss.
Shen Zechuan: Doesn't say the words, but you hear the f-bombs anyway.
Xiao Chiye: Not as much as you would expect. He prefers physical violence to verbal violence.
Qiao Tianya: All day every day but nothing too extreme or creative.
Yao Wenyu: A Peerless Gentleman Does Not Swear You Blithering Idiot.
Xiao Fangxu: Exactly as much as you would expect, and exactly the words you would expect, but never in front of grandson.
Xiao Jiming: You would think he wouldn't. You would be wrong. Listening to him on the battlefield or in the military camp is like listening to an extremely vulgar, yet almost poetic, dare I say Shakespearian, Elder Swear. Censors would have a continuous bleep until he stops to take a breath. He apologizes before his mother's grave twice annually. His swear jar could fund the entire Cavalry, if he had any money to put in it.
Lu Yizhi: This is literally the most perfect, virtuous woman on the planet. She said fuck exactly once and morale plummeted because everybody figured if even she was saying fuck, they were well and truly fucked. She will beat you with her shoe if you cuss in front of her son.
Xiao Xun: His first word was fuck. Learned it from his dad. That was the first time anyone thought the Xiao-Lu marriage alliance was in danger. Xiao Chiye tried to take the fall all the way from Qudu. In the end, Zhao Hui said he taught it to Xiao Xun. Lu Yizhi didn't buy it, but let the matter go because she approved of his loyalty.
Guo Weili: Yes, but not well, so he shouldn't.
Lu Pingyan: This man is too tired to cuss.
Lu Guangbai: Only says the swear words that are in the bible, says them quietly and without emphasis, does not believe men should be using misogynistic slurs because Qi Zhuyin beat his ass over it once.
Qi Zhuyin: Only swears for extra flavor in her threats. She prefers to be menacing without them.
Qi Shiyu: Used to swear a lot, got into it with Xiao Fangxu, then decided cussing was low class like Xiao Fangxu and stopped.
Chen Yang: As it suits him, but rarely to the extreme.
Gu Jin: Knows all the best and most creativd swear words, but refuses to use them in front of Ding Tao.
Ding Tao: Said "damn" once and received five separate lectures and two snow burials. Shizifei said she wasn't angry, just disappointed. Never said it again.
Tantai Hu: Exactly as much as you would expect. His mission in life is to make Ding Tao as bad as him.
The Empress Dowager: Worse than Xiao Jiming, she just keeps it behind closed doors.
Hua Liangyi: Enjoys calling men "bitch".
Xue Xizhou: He did a long term cost benefit analysis of adding cussing to his political persona and he polled 15 points lower per year. Decided to be squeaky clean. But in his heart, just know he has already offended you.