Look in this product's plugin titled "Display Usergroup Legend in WGO" and locate the line:
Code:
$usergroup_list .= '<div style="display: inline-block; padding-left: 0">' . $vbulletin->usergroupcache[$id_arr[0]]['opentag'] . '<span style="font-size: ' . $vbulletin->options['markfl_usergroup_legend_delimitsize'] . '%; ' . $vbulletin->options['markfl_usergroup_legend_delimcss'] . '">' . $delimiter . '</span>' . $uname . $vbulletin->usergroupcache[$id_arr[0]]['closetag'] . ' </div>';
You can edit that to your liking.