Scarf Girl in various episodes.
Scarf girl in episode 16
Scarf Girl (or Bad Luck Girl) is an anonymous woman who appears in the background of every episode.
She has become something of a meme, appearing so often that the fandom regards her as an actual character.
In episode 15, she is seen wearing a waitress uniform at the resturant that the Heroes frequently eat at impying that she works there
Gallery
During the BTB concert (EP. 14)
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During the Tiger and Bunny chase. (Ep 22)
Meeting Origami Cyclone (Ep. 10)