API call on character does not return all fields

API call: http://www.giantbomb.com/api/search/?api_key=YOURKEY&format=json&query=%22lightning%22&resources=character

*enter your own key if you wish to test this

this does not return fields such as 'friends' and 'concepts', even though they exist in the database, for example: http://www.giantbomb.com/lightning/3005-773/