(n.) One who admires; one who esteems or loves greatly.

Maecenas abettor adherent adorer advocate aficionado amateur amorist angel apologist backer beau booster buff champion collector darling defender dependence devotee dilettante encourager endorser enthusiast exponent fan fancier favorer follower friend at court groupie idolater idolizer infatuate lover mainstay maintainer paramour paranymph partisan patron promoter protagonist pursuer reliance rooter second seconder sectary sider sponsor stalwart standby suitor support supporter sustainer sweetheart sympathizer upholder votary well-wisher wooer worshiper