Someone who's on your side, who supports you wholeheartedly, is your sympathizer.

A sympathizer wishes you the very best, especially when you're going through a hard time or working to achieve a goal. Your best friend might be your number one sympathizer, agreeing with your opinions and backing you up when you need support. Key to the noun sympathizer is the verb sympathize, "agree with a sentiment" or "have fellow feeling." Both words come from the Greek sympathes, "affected by like feelings," a combination of syn, "together," and pathos, "feeling."

Definitions of sympathizer

n one who commiserates with someone who has had misfortune

comforter, sympathiser
Job's comforter
someone whose comfort is actually discouraging
Type of:
a person who communicates with others

n someone who shares your feelings or opinions and hopes that you will be successful

sympathiser, well-wisher
bleeding heart
someone who is excessively sympathetic toward those who claim to be exploited or underprivileged
fellow traveler, fellow traveller
a communist sympathizer (but not a member of the Communist Party)
Type of:
admirer, booster, champion, friend, protagonist, supporter
a person who backs a politician or a team etc.

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.