Yes, @Avalon, a “Felicista” can be translated as “a supporter of Felix”. It would normally be “FeliXista”, but the X becomes C because it is easier to pronounce. The suffix
-ISTA, even if it looks like having a feminine ending, is used for both masculine and feminine genders: a “Zapatista” is either a man or a woman that supports or follows Zapata, the Mexican Revolution hero; a “Peronista” supports Perón, the Argentinian 1950s President, etc. And, yes, I am a native Spanish speaker.