The first one I really remember paying attention to is Annie from Popeye's Louisiana Chicken, and from there it's been everything from Matt of Carmax to these new commercials (of I forget which car company) where they have splash screens of the characters' names when they've completed the obstacle course of supposed "hard customers".
This comes to me because, partly, I wear a nametag at work and partly because I – based on apparent work standards – have to "introduce" myself to every customer. I can't help wondering if this is a change that had occurred — if at all — around the same time commercial characters started getting names. I can sort of get it as far as those characters go, since, I suppose, those that do have names are in a sequence of commercials either in format or in "storyline".
Logically, it's begun to make sense for me too, the self-introduction (though it's so intensely contrary to my self-effacingness most of the time): when you come back, you know me as more than just the ugly, big-headed, Spanish-speaking burnt-Black dude in glasses. At the same time, the vast majority of the people I deal with don't (seem to) come back due to their being transient, or if they do it's either I've not dealt with them sequentially or I've just forgotten them completely.
I suppose it's partly an exercise to get me to like myself more. Who knows?
Welcome: my name is Kris and I'm here to assist you today.