Like in real life, sisters share different personality traits, same in astrology, these two zodiac signs share unique personality quirks, but the very first query is how these two signs, Leo & Aquarius known as sister signs; it is because they are opposite each other on the zodiac wheel. Sister signs share a mode (cardinal, fixed, or mutable) and are 180° apart on the zodiac wheel. Leo is a fire sign known for being passionate, creative, and wanting recognition. They are also natural leaders who are often vocal about their opinions.