It's actually difficult to give an exact response because Sun and Moon are only two (though the important two) placements, so some of your 'unexplainable attributes' may be due to things other than the Sun / Moon combination.
If you post your birth details - hh:mm, dd/mm/yyyy and place we can be a bit more exact.
Leo Sun's are associated with a generous, demonstrative, dramatic expression of one's underlying creativity and will power. The Scorpio Moon gives an intensity of feelings and emotions which might well intensify the Leo characteristics as well - leading to being somewhat over dramatic and intensly loyal. Much would also depend on whether Sun and Moon actually aspect each other, especially by square.
How this plays out in your life would also be heavily influenced by the House placements of the luminaries.