> David Tennant uses his Scottish accent for jokes in a show where he normally sounds English
may i ask that you clarify this point?
tennant made a personal choice NOT to use his native/normal scottish accent for Dr. Who. he discusses this with Jodie Whittaker (also someone with quite a strong native accent) in an episode of his podcast, he TL;dr said it didn't feel quite right for him to use his native accent for the role [1].
whenever tennant does TV "as himself" (for example the voiceovers he has done for various shows or charity events like comic relief etc) he uses his own/native accent, is he doing this for laughs/jokes? surely he is doing them with a scottish accent because that is actually his literal normal voice?
Though I have to admit the reason I think of him when it comes to doing accents is his American accent that's supposed to be NorCal but sounds like it's everywhere else at the same time.
eg David Tennant uses his Scottish accent for jokes in a show where he normally sounds English