As a Hero, the character will develop and level up until they become a demigod, then they will continue doing so until they become a god. As they level up, they can add domains and portfolios as a god would. That means that by the time the Hero becomes a god, they won't necessarily be a Level 1 god. Heck, he might even be a higher level some of the current gods.

However, he can only start off with one domain and one portfolio. If he wishes to add others later, he can do so. I'll get the specific leveling and Might mechanics up when they are needed. For now, I reckon this is reasonable. If anyone has suggestions or objects, feel free to voice your thoughts.