It's an interesting question that, but the game seems to have everything in line with the rest of the Telepath Universe and you do get greatly talented people who do not partciipate in world-changing events, like the Main in TRPG2, but do their little bit on a local stage - like the Hero of TPA1.
It's hard to judge, so far, especially as one of the strong candidates- the TSoG Hero, is still not completely finished- he may learn yet more attacks or be able to learn more than one type of elemental attack- if he does, then he'd probably be the strongest Hero, with more attacks in both defense and offence, available to him.