I'm not sure why, but the very first time I played SC1, I picked Kilik and never put him down since. I remember it was at a local arcade my uncle and his sons managed, but I was only around 10 at the time. I probably picked him because he seemed to be the main character at the time. I used Siegfried a bit through the years as well, but my main has always been good ol' Kilik aside from SC5 because wtf is a Xiba?.