Thank you so much for playing, your comments are inspiring! Good job on getting all the endings with ease too~
As for the person the person in the banner at the top, his name is Reihar, he doesn't appear in the game but I guess the simplest way to describe him is that he's sort of the villain in Zayo's story? They have a very complicated relationship. This is the full pic btw, there's some hints in the description and comments, if you're curious to find out more: http://fav.me/d60u8oh .
Let me know if you want to know more and i can point you in a direction or I'm happy to answer any questions!