So what is the difference between a beryl and a shajad then?
Just to do what ever it takes to improve yourself. To what end? Just so you can be better then every one else, for bragging rights? I still have yet to be convinced that Noaha is good.
What is the difference? The Shajad are Dark Aspected and Beryl are Light Aspected. What does this mean, exactly? Nothing. There is no real difference. In general Beryls are nicer and Shajad are meaner, kind of. I suppose it would be better to say Shajad are sterner than Beryl. This is not always the case though.
Noah is interesting. He does not care the end, only the means. As long as you want and try to improve he will grant you Elan, your ends do not matter. Want to rule the world? Protect as many people as possible? Slaughter as many towns as you can? Defend your homeland from enemies? He does not care, as long as you try to get better.
Also remember Noah isn't just about improving, but improving and using the power you gain properly to whichever end you choose. You lose Elan for, "Abusing power foolishly". Noah is dark aspected because he embodies improvement for improvements sake, as that he does not care about your goal. However people who follow him can be improving for good or bad ends.
Noah is not good, but that is the point: No shajad or Beryl is good or bad (Abbadon excluded) they are merely powers. The people that follow them can be "good" or "bad", but they don't care about such concepts (save Abbadon-ish). Noah cares about people improving. That is it. Trying to apply human reasoning to "gods" is kind of pointless. However if you want to consider them on a scale of good or evil consider them as both good and evil, not one or the other.
As per the part about improving others, he does not care if you do that. What he does care is if you get people to make their own lives better. Proof of this is that he grants Elan for, "Imbuing self-improvement drive to others" and one of his powers he grants is, "The Will to Improve" which makes all those around the person with the power want to, "improve and better themselves".
It would probably be better to think of them as cosmic forces like gravity, death or heat than as beings with human emotions. They do what they do because it is their nature; good and evil, right and wrong, chaos and order, these things mean as much to them as they mean to gravity. (People will probably disagree with me here, as that they are alive, but as gods they are more and less complicated than other beings.)
Abbadon is the best example of this. While he is the embodiment of Evil, he is also not technically evil. Evil requires a moral code that can be enforced, he is merely doing what is in his nature. He is no more evil than gravity when it causes a plane to crash, it is the nature of things. You do not blame gravity for killing the people on the plan any more than you blame the Law of Conservation of Momentum when someone dies in a car crash.