Leo sign compatibility with Capricorn. Leo and Capricorn? Fire and Earth... Hardly had it begun, when it ended. What’s the best aspect of the Leo-Capricorn relationship? It’s their devotion to handling the task in front of them. Both Signs have strong personalities, and though they may at times seem an unlikely pair, this is a case of opposites attracting. This duo has a good time with one another, and this facet of the relationship keeps them wanting more.