The fonts are from KQVI (the capital letters are a different font than the lower-case letters). I extracted both from the game's resources, though I'm not sure where capital letters come up in-game.
Additionally, the border is from KQV's text dialogues, the picture of Alexander is from TSL, and the background is the opening screen from KQVI.
Hm, I just thought: I would really like to have a KQV/KQVI dialogue font for use on modern computers. For the banner and for my TSL Comedy Contest video, I manually copy/pasted and arranged the letters, but obviously that only works for a small amount of text. Having an actual font would be great. I'm going to make that when I get a chance.