Basically any Freikorps that have useful abilities for Hannah to duplicate, like Librarians.
I'm not sure about I Pay Better in small games. Cards are too precious to easily discard.
I started with Rusty Alyce with From The Aether, as having a free model now and again can be very helpful, and giving her Instinctual as an upgrade allows her to summon every turn for a 7 and a 10.
And that is why news of it should have been kept under wraps until about three months out from release. Knowing 3.0 is coming out creates apprehension for players, as evidenced by this post.
Four of the masters I'm interested in, Collodi, Nicodem, Ramos, and Lilith, all gone.
Hoffman is taking over Ramos's role in Arcanists, but there doesn't seem to be anyone for those who liked the other three masters.