Ertholt is solidly lawful neutral and doesn't really care about others so long as it doesn't interfere too much with his abstract goals.

That said, any other character that works towards reshaping the current state of heaven into something that coincides with what he believes is an orderly universe, he'd support them to a degree. 

So characters like Tachton so far, and depending on what they mean in their path, Arasti.

Everyone else would have neutral relations with degrees of closeness from his point of view.