Variable. The level of magic is going to depend on the world created by the author. While Alternate World stories are mysterious and imaginative, magic is not necessarily a strong component of the world. Magic of some kind is almost always present, but really it's the fantasy of an alternate world that takes precedence.

Variable. By constructing another world, writers have plenty of opportunity for the exploration of social constructions and ideas. However, this opportunity is not always taken advantage of by writers, who may prefer indulgence in imagination (rather than getting bogged down in social commentary).

Moderate. World-building is the most important part of an Alternate World story, so sometimes developing characters takes a bit of a back seat. This is not to say that characters are flat or lifeless, just that readers will often get a break from them in order to see more of the fantasy world.

High. Plots of Alternate World fantasies tend to start in similar ways: a mysterious and magical world is found and the protagonist finds him/herself invested in it somehow. Adventure, journey, discovery, and mystery are all common elements of Alternate World plots and when woven together make for an active and engaging story.

Variable. The level of violence will depend greatly on the world created. The protagonist may be transported to a magical world and become its hero, doing battle to save a fantastical race of whatevers from devastation. The protagonist may embark on a more personal journey of self-discovery, with very little violence at all.