How to display Individual Custom Fields in a Participants View
You should be able to achieve what is required by creating a CiviCRM Participants view and using the CiviCRM Participants: Participant's Contact ID as a relationship to bring in contact custom data –





Or import the belew view (I've removed custom data so this needs to be added yourself) -

$view = new view();
$view->name = 'individual_and_participant_view';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'civicrm_participant';
$view->human_name = 'Individual and participant view';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master /
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Individual and participant view';
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['pager']['options']['items_per_page'] = '100';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['pager']['options']['id'] = '0';
$handler->display->display_options['pager']['options']['quantity'] = '9';
$handler->display->display_options['style_plugin'] = 'table';
$handler->display->display_options['style_options']['columns'] = array(
  'id' => 'id',
  'display_name' => 'display_name',
);
$handler->display->display_options['style_options']['default'] = '-1';
$handler->display->display_options['style_options']['info'] = array(
  'id' => array(
    'sortable' => 0,
    'default_sort_order' => 'asc',
    'align' => '',
    'separator' => '',
    'empty_column' => 0,
  ),
  'display_name' => array(
    'sortable' => 0,
    'default_sort_order' => 'asc',
    'align' => '',
    'separator' => '',
    'empty_column' => 0,
  ),
);
/ Relationship: CiviCRM Participants: Participant's Contact ID /
$handler->display->display_options['relationships']['contact_id_1']['id'] = 'contact_id_1';
$handler->display->display_options['relationships']['contact_id_1']['table'] = 'civicrm_participant';
$handler->display->display_options['relationships']['contact_id_1']['field'] = 'contact_id';
/ Field: CiviCRM Events: Title /
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'civicrm_event';
$handler->display->display_options['fields']['title']['field'] = 'title';
/ Field: CiviCRM Contacts: Display Name */
$handler->display->display_options['fields']['display_name']['id'] = 'display_name';
$handler->display->display_options['fields']['display_name']['table'] = 'civicrm_contact';
$handler->display->display_options['fields']['display_name']['field'] = 'display_name';
$handler->display->display_options['fields']['display_name']['link_to_civicrm_contact'] = 0;

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['path'] = 'individual-and-participant-view';