Well now I have to do my take on it...
Uses mild swear words and feels all edgy and cool because he Said A Bad Word! hehehoohoo!
He is actually literally using "giddy aunt" as a swear word. He's decided cussing is childish and not very intellectual.
Swears eloquently in several languages, but rarely a language his listeners can understand. When he does use English, the words he chooses are usually archaic. That doesn't stop a few of them from being recognizable. Fuck has been around for a long time.
Swears like a sailor and is deeply annoyed to discover the existence of the TARDIS swear filter. He eventually manages to disable it, but Romana turns it back on and makes sure it stays that way.
He doesn't need to swear, he can passive aggressive sarcasm you to death. But when he's really exhausted, he hasn't forgotten any of Four's favorite words.
He doesn't need to swear, he can sass you to death. He shares Two's opinion that swearing is childish, why be crass when he can be eloquent?
Mostly doesn't swear, but when he does, Ace and Benny learn new words.
He starts off thinking it's crass and rather beneath him, but by the time we get into the War he's given up on the eloquent romanticism and he'll just tell Ollistra to go fuck herself. (So will War)
He seems like he'd swear but actually he doesn't. It would be too obvious, and also too much like the wartime version of himself who stopped caring how he sounded. He drops an occasional non-translated Gallifreyan swear word in moments of intense stress, but for the most part no.
Not when he's consciously keeping his happy dumbass persona. But when he lets it slip and his darker side comes out, he'll use a few very well-chosen and vicious vulgarities.
Swearing just sounds ridiculous. He tried it a few times and Amy laughed at him; he sounds like a kid trying out his first bad words. He feels more comfortable with milder language.
Early on, not much, because he's too focused on who he is and what kind of person he is to let himself slip into careless vulgarity. Later, once he chills out and starts feeling more comfortable in his skin, he'll drop the occasional swear, but not super frequently. He still tends to choose his words carefully and make them matter.
Lol yeah she's on Four's level of telling everyone and everything to go fuck themselves. She doesn't try to disable the profanity filter though, because she feels a little embarrassed about expressing herself in such a simplistic way.
Not much, but he picks up a few habitual swears from Donna.
He's way too careful about his diction and presentation to swear casually, but in exactly the right situation, he might use a carefully chosen word for emphasis or to startle someone into listening.
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