Can't talk about navels in video games without some of the women from Overwatch!
D.Va bares hers in her "Scavenger" and "Junker" Skins (looks better in-game)
Symmetra in her (controversial) "Devi" and "Goddess" Skins
In some of the official concept art, Mei is showing hers as a concept of what she looks like under her parka (fingers crossed for a future potential skin)
And as of today, Tracer gets to show hers off with the new promo skins for the Rio Olympics!