Very impressive work!
The abilities are all creative, the photoshopping is fantastic, and you even made power cards! What's more, most of the heroes seem to fall into the range of having a total of 20-23 on their stats, in line with the 6 official heroes, which is a detail that's always nice to see. =)
Silhouette, of course, is on the low side with a total of 18, but her ability to never lose determination tokens is very powerful. Maybe too powerful, but I'd have to play with her once or twice to say for sure.
Mad Carthos is definitely a bit too powerful on stats, I think, with a whopping total of 28 combined. Sure he never gets determination tokens, but who needs them? All of his numbers are statistically more likely to pass than to fail, barring modifiers (of which there are relatively few from what I've seen of the game.) I think he could be toned down to all 6's and still be a very strong character.
PS: I love Jaes's ability to slay the dragon and win that way. Very original! If you haven't already, you should upload these to Boardgamegeek. I'm sure the people there (who don't also frequent here) would love to see them. Once again, very well done!