I think that sometimes it might be part of fleshing out a character just like any other trait such as a limp or playing with a lucky coin etc. but that it is possible to overdo it at the same time. And of course there is the still small voice that will ask, "is this really necessary in order to flesh this character out?" as well. So it's a balancing act. First is it necessary for the character and second is it too much?
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