Wow, a great question that nobody ever bothered to answer.
I think the Idealist’s powerset is wasted on her, although it’s unclear whether she can create things for other than combat applications. Maybe go Captain Cosmic instead, depending on what limitations both powers have. But either way, conjuring objects out of pure energy seems like the way to go, in terms of actually accomplishing anything.
Then again, if I was actually just living my life, it’d be hard to argue with Haka’s invincibility.