@Midnightgunner Well, equivalent to Mercy being the token hot older blonde character, D.va is the token cute young Asian girl. Both are stereotypical, yes.
I'd be hard-pressed to call that a maid's headband in particular. Traditionally manga/anime shows that as a black band with a white frill. This just looks more like a regular headband that anyone might have.
^ Yeah, they're traditionally black and white, but they don't have to be. This one looks like it has black lace frills, and I don't think a regular headband would be so decorative.
Ornamental headbands are not uncommon in manga, I too do not think it is a maid's headband. Besides, the blonde girl is also wearing a frilly cuff on her wrist, that is a maid thing. So is that frilly what-you-call-it, on her thigh. Compare with these examples.
@Salamandrake I dunno if it woks the same in the US but in the UK post seems to have set people - we have had the same post lady for about 10 years or so. (Not counting the courier services ofcourse).
In the US we usually do have a regular mail man/lady, but most packages seem to be handled by fedex or ups and we always get diff workers for those.