Brief explanation for Leo with the signs
Leo + Aries = Passionate, but both are too selfish. Maturity and compromise from both signs would make this relationship perfect. They would energize and encourage each other. They wouldn't get bored and would help each other grow as humans.
Leo + Taurus = Leo would get bored of taurus because of a tendency to do the same **** everyday. Taurus would find Leos demands ridiculous. This couple, however, would be known as a stylish and fashionable couple with a fine taste for the luxuries.
Leo + Gemini = Good romantic relationship but Leo would get bored with gemini's fluffy words. Gemini keeps Leo stimulated and Leo keeps the positive vibe with gemini. Makes for a good friendship I think.
Leo + Cancer = Pretty good. Leo may hurt cancers feelings though and Leo wouldn't understand cancer's sadness or protective nature.
Leo + Leo = There can be only one king
Leo + Virgo = Virgo would point out all of Leos flaws, which is opposite of what Leo wants. Leo sees virgo as someone who can't see the forest for the trees and utterly fickle.
Leo + Libra = Match made in heaven; the ultimate "everyone talks about them" relationship. Tendency towards superficiality and shallow bonding but who cares right??
Leo + Scorpio = Both would try to control each other and that wouldn't work, but would be super passionate. Hawt healthy sex though that's for sure. They could learn a lot from each other.
Leo + Sagittarius = Really good relationship, but may be short-lived. Better off as BFF's.
Leo + Capricorn = Power couple, but capricorn would get sick of Leos spending habits and immaturity and Leo sees cappy's nature as too serious.
Leo + Aquarius = Compliments each other. Aquarius would be too detached for leo though, and Leo would be too affectionate for aquarius. Much potential for a fun relationship with all the crazy random **** that they could do together.
Leo + Pisces = I think this would be pretty good. Leo could direct and keep pisces out of the lazy dumps. Pisces appreciates leos affection and idealistic nature. Leo would get frustrated with Pisces being in la la land though.