I would make Eragon true to his upbringing: an honest, respectable, salt-of-the-earth farm boy who loves his family and understands how difficult life can be for the poorest. Someone who believes in justice and mercy, has compassion for people who have less than him, and doesn't stand for dishonorable conduct such as hitting someone while they're down or using non-combatants and children (like Elva) for his own advantage.

I.e. an actual hero type like Paolini tried to claim Eragon is, but one rooted in his peasant farm upbringing. This Eragon doesn't put on airs, is uncomfortable with finding himself in a position of privilege and power, but works hard to live up to people's expectations.