Say Aurora and Northstar are adjacent and there is only one opposing character within range and line of fire. Aurora uses Pulse Wave, does she draw line of fire to Northstar? Or since it doesn't affect him, he isn't included and she does full damage instead of 1?

It's the same as the old rulings on:
LoFs are still drawn to them even if they are unaffected. The damage goes to 1.

Ok, so he just doesn't take damage then?

He also doesn't have his powers ignored, which I can't think of any reason why that would matter right off, but there you go.