[AngelicaDeAlquezar]

An "aficionado" is a keen follower of an activity (someone who likes and knows about something like football, ballet, cooking, etc.).
It may also be a person who is not a professional of those activities, and practices them informally (like an amateur dancer, a non-professional football player, an amateur cook).

An "hincha" is specifically an enthusiast follower/supporter of some sports personality or team.
(I've never seen it used for a follower of a singer/actor/politician/etc.)