Jim's idiosyncrasies...well, hard to say which ones are real, because either everything's a performance and actually aids his job - plus, are more fun than annoying - or they're so minor they don't need registering in first place.
For example, he has a penchant for committing crimes/making an entrance to music - breaking into the Tower, waiting for Sherlock with the Bee Gees, that S4 dance in front of the helicopter - but that's not just him being a massive, massive showoff. I suppose some people might raise their eyebrows and wonder if it's necessary (looking at you, Mycroft), but it's to focus attention where he wants it. And also because he's a massive show off.
I suppose the main one, actually, would be the way he runs his mouth. Lots of innuendos, quite often sexual in nature, and double entendres designed to make people uncomfortable or put them off balance. He's a constant, incorrigible flirt, and I imagine he's pretty much always like that. Which when dealing with certain elements of the criminal underworld, probably annoyed some people. It obviously didn't affect his business, so safe to say it was overlooked. But then, he rarely dealt with the little people face to face, and canon shows his typed interactions (at least when not dealing with the Holmes') to be a lot more serious, so maybe he kept the flirting to a minimum on purely business matters.
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For example, he has a penchant for committing crimes/making an entrance to music - breaking into the Tower, waiting for Sherlock with the Bee Gees, that S4 dance in front of the helicopter - but that's not just him being a massive, massive showoff. I suppose some people might raise their eyebrows and wonder if it's necessary (looking at you, Mycroft), but it's to focus attention where he wants it. And also because he's a massive show off.
I suppose the main one, actually, would be the way he runs his mouth. Lots of innuendos, quite often sexual in nature, and double entendres designed to make people uncomfortable or put them off balance. He's a constant, incorrigible flirt, and I imagine he's pretty much always like that. Which when dealing with certain elements of the criminal underworld, probably annoyed some people. It obviously didn't affect his business, so safe to say it was overlooked. But then, he rarely dealt with the little people face to face, and canon shows his typed interactions (at least when not dealing with the Holmes') to be a lot more serious, so maybe he kept the flirting to a minimum on purely business matters.