Passing user meta through comment form

If you look in your theme’s comments.php file, you should see a call to wp_list_comments. If that has a callback parameter– something like this array( 'callback' => 'twentyeleven_comment' )— then your theme has its own comment display function. Find that function. It is probably in function.php but no promises. If not, you need to make one. That function controls the comment display. Inside that function do something like this:

  $user = get_user_by('login',$comment->comment_author);
  if ($user) {
    $umeta = get_user_meta($user->ID);
    echo '################################';
    var_dump($umeta);
    echo '################################';
  }

And you should have what you need– just a matter of formatting it.

http://codex.wordpress.org/Function_Reference/get_user_by

http://codex.wordpress.org/Function_Reference/get_user_meta