As of today, version 1.16 of [SOUP](https://stackapps.com/questions/4486/stack-overflow-unofficial-patch) now includes the following minimal CSS fix for this issue:

<!-- language: lang-css -->

    a.owner, td.owner { background: #eef }

This causes the question poster's user card and username in comments to be shown on a light blue background, like this:

> ![Screenshot][1]

Per the SOUP inclusion guidelines, I deliberately kept this fix as neutral and minimal as possible.  If you want something fancier, you can always [install](https://gist.github.com/vyznev/944e0ac962790bcc97d0/raw/74571aa81bfb649512fa001f81ba0e864b6f0409/metacircles.user.js) the [user script](https://gist.github.com/vyznev/944e0ac962790bcc97d0) I posted in [my other answer](https://meta.stackexchange.com/a/231282) (which, yes, should be compatible with SOUP).

  [1]: https://i.sstatic.net/BVJ9F.png