It's an old thread, I know, but considering there are only 5 threads in this subforum, I don't think it's worth making a new one.
My two cents on this one: TRPG1&2 is the most powerful hero. My reasoning is simply that of accomplishment.
By the age of 18, the TRPG2 hero has killed the Shadowling Queen, who is considered a diety by many. Even though she isn't really a diety, that shows shes pretty tough, to say the least. The TPA1 hero is pretty good, to say the least. However, I just don't think that hero has accomplished enough to be considered 'powerful'. Winning a tournament (Even a grand tournament) is big, but considering that there's no mention of it anywhere in SoG, I'm inclined to believe it wasn't that amazing. Besides, if it was, I doubt the people of Ravinale could be tricked into believing all psy are evil. After all, they hosted a tournament that attracted hundreds of psy, it's not like those with the gift are unknown to the people of Ravinale. Duvalier is a good candidate as well, but to recap-The hero of TRPG2 killed Nelis at the age of 18. At the same age, Duvalier was learning mind blast. Now, he may have progressed in ability quickly-but he also has one of the best teachers in the world, quite possibly the TRPG2 hero himself.