Do characters have a preference for the Names of God?

Here's the experimental graph - I hope I got the counts right this time.

So Elihu uses El over Eloah or Shaddai, Eliphaz uses them equally, יְהוָה uses El, Eloah, and Elohim, Job prefers Eloah but uses El and Shaddai also and יְהוָה once, and the Narrator is quite distinguished from the other characters.

This count could change if some of the verses are quotations from other speakers.