What in my chart has the largest impact on who i am?

All the leo and cancer in your chart, you feel like a leo (moon in leo), you think like a leo (mercury in leo), you are a cancer (sun in cancer), you love like a cancer (venus in cancer). Also your scorpio rising, pluto conjunct ascendant, has a VERY big effect on who you are. You are probably more scorpio like than anything because of that pluto conjunct ascendant.