My first time through the game, I missed a lot of things. I let people die because I had only ever played part of Lynn's story in FE-whichever, where people came back, and I didn't realize so many people were recruitable. About three-fourths of the way through I found this place and facepalmed at all I had done. I didn't realize until the end that people didn't come back. I know I didn't get Heather or a bunch of other people, and I certainly lost out on my favorite character, Soren, because I let him die (thinking he was girl (even though my hair is longer than his)).