noun (n)

• commiserates with someone who has had misfortune(noun.person)

  Synonym:
  comforter, sympathiser
  

  source: wordnet30
• someone who shares your feelings or opinions and hopes that you will be successful(noun.person)

  Synonym:
  sympathiser, well-wisher
  

  source: wordnet30
• One who sympathizes.(noun)

  source: webster1913