Quartz
Hero
Are we talking full god level here? Or demigod / hero-god / quasi-deity / whatever? Straight off, the former is out but the latter should be entirely achievable. Let the character take levels in appropriate prestige classes, gain the Saint and celestial templates etc. Then become a full deity later. Or bargain for it a la Ortwine / Sepulchrave. The point of the game is to have fun, and if fun means becoming a divine being, then so be it.