User blog comment:SayuriDarling/Magnus Chase and the Gods of Asgard Official Discussion/@comment-24883778-20141012114021

I really wanted Magnus to be a legacy of some sort. Rick introduced the concept of inheriting divine powers through the generations, so I really wished he'd develop the concept in another series. We have demigods for Graeco-Roman, magicians in Egypt and, when everybody thinks we'll get something new for Asgardians... bam - demigod again.

Characters in "Gods of Asgard" being legacies would provide a new opportunities. Think about this for a second, while reading summary and what we already know from Blood of Olympus:

Annabeth mentiones having a cousin and an uncle in Boston - kinda clear.

Summary claims Magnus, after his mother's death, meets an uncle he's never met.

Those two information put together means the person Magnus is living with (possibly) is both his and Annabeth's uncle. That means we have a third party. Frederick, Magnus' mother and the mysterious uncle are all from Chase family.

Now, imagine the mother being a legacy of a Norse god. Then, Frederick hooks up with Athena, why? Because she senses a divine blood hidden within him. This would make Annabeth being both a Greek demigod and having Norse blood in her. Now that's an interesting setting and a way of putting Annabeth inside the new trilogy.