It would be Kelsier. I was amazed with him throughout TFE. I believe in him. When Lord Ruler struck him with the spear after telling him “But you can't kill me, Lord Tyrant. I represent that one thing you've never been able to kill, no matter how hard you try. I am hope.” I felt like Vin did.
Watching Vin take his torch and defeat Lord Ruler at the end of TFE was great vengeance to the Survivor!
Then in secret history. I love how he had the audacity to punch a God.
Second favorite is the married couple of King Elend Venture and his wife, the Ascended Warrior, Vin! To watch them grow and die together was a journey. Hopefully we get to see them again in the other side.