Guavas
Passionfruit
Lychee

Not exotic, but not eaten by many and that I love are persimmons and kumquats.
Originally Posted by Saria
Plus pomegranates, tomatillos, starfruit, yuzu and dragon fruit

I like sour fruit that is not super sweet, so I typically prefer fruit that is not quite or just becoming ripe. Many of these fruit stay sour even when ripe so they're favorites.
People rise to the standard expected of them. GC