Every character in the world of Black Desert has a zodiac sign (ingame referred to as "horoscope") which affects their personality. You gain more Amity when talking to an NPC with the same horoscope. Otherwise, horoscopes have no impact on gameplay.
List[]
Sign
Traits
SHIELD
Rational, disciplined, methodical.
GIANT
Dreamer, ambitious, swift, an observer.
CAMEL
Perseverance and patience, gentle, talented.
BLACK DRAGON
Wealth and fame, noble, delicate, sensitive, sociable.
TREANT OWL
Simple, genuine, knowledgable, a genius or an idiot.