Special:Badtitle/NS90:Forum:Trope Talk/Is there a trope for protagonists with few distinguishing features?

Basically the non-interactive media equivalent of Heroic Mime. It occurs to me that some book, movie, and tv protagonists are so plain that they almost serve the function of video game protagonists. They are merely a vessel through which the viewer experiences the world rather than a 3d character in their own right.

I suppose one problem would be that this would be a pretty subjective trope