[@easy modo] Since I might not get the section that would answer your questions up til tomorrow morning, I'll do it now!

1 - Up until three centuries ago, Angels and Demons were locked in a bloody conflict. For reasons unknown to either side, the ancients of both sides vanished and the younger generations stepped forward to look for peace. Although an uneasy truce, Angels and Demons generally tolerate each others presence and can interact civilly.

2 - Racially, their magics aren't weak or stronger against the other. The magics were developed for different purposes. Their magics were made to handle their specific environments. For example, Pandemonium is a dimension in constant chaos. In order to survice, Demons developed magic that could reenforce or change physics like strength in gravity or turning a solid to a gas instantaneously. Angels however live in a world where the conditions are realiatively unyielding even in the face or magic so developed strong Enchantments like flight and anchoring.

3 - These races currently act similar to those of the Prime Dimension. They have free will and develop their own individual personalities. However, their social environments are totally differemt. Demons live in loosely organized social constructs. They tend to defer to a general but it's very much a on your own lifestyle. Angels on the other hand, enforce structure and order severly. 

Hope this helps!