Nothing wrong with using BOTH theme tags and the author name as tags.
To keep things neat I might run the site on Drupal rather than Wordpress, since that lets you add fields to your content types (that is, you could have several "tag clouds", one for authors, and one for tropes), or I'd look into adding that to Wordpress (which is possible, but requires enough confidence to copy, paste, and adjust code snippets).
That's assuming one's own domain. I don't know how tweakable blogs hosted on wordpress.com are, but if you could add your own theme, the latter is possible.
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