The phrase "ardent follower" means someone who strongly supports and believes in something or someone. They are enthusiastic, passionate, and dedicated in their loyalty. Full definition
Everyone, from the most casual sports games fans to the most ardent followers of the sport, make it a habit to play the newest iteration every year. (heavy.com)
Cincinnati's ardent followers figured this year's team would be even better. (si.com)
Corbyn idolised Tony, remaining passionately supportive even after Tony had lost the 1981 deputy leadership contest when other ardent followers drifted away. (totalpolitics.com)