I can add to this for the two EA schools I was accepted to.
College Accepted To: Georgetown University School of Foreign Service
Essay 1: Very detailed essay about the club I founded and my personal passion for the issue. It combined leadership with service.
Essay 2: Same as my common app essay, it was about my multicultural background and experience with a unique international project; I think it set me up really well for readers to see the connection between my cultural experience and my passion for IR.
Essay 3: For the third essay, SFS applicants had to talk about a global issue that matters to them. I discussed ISIS. I think this essay is the one that got me in, as I had a unique viewpoint based on doing far more research in this area than most of my peers, and it was a very factual essay.
College Accepted To: Lewis & Clark College
Essay 1: the “Why L&C” essay. I really captured the ethos of the school by detailing my intense passion to learn, about anything and everything. I also think I did a good job with demonstrating how I will involve myself in the community.
Essay 2: This supplement was about a time you engaged with diversity; I talked about giving a speech to my school. Written like an in-the-moment story.