I'm a big fan of the librarian. She can heal up both viks per spell, plus she gives you +1 to your control hand. You need to pitch a card when she activates or she becomes paralyzed, but the suit of the pitched card is added to her Ca for the turn. Plus you can heal up Sue is Sue decides to do her 1 action hurt for more cards.

Sue is a great model, but the downside is he cannot be taken in a crew that contains VonShill. Vonshill is a great minion to take, so it's a toss up.

With the Viks i'd recommend the biggest soulstone cache you can get. I like running with 8 stones if possible.

Student of Conflict totem is great for the Viks, giving one of them fast almost always seems to help alot. having a vik with 3 general action points plus melee expert gives you just so many options its great. Using one of those action points to sisters in spirit the other vik into place and them hitting hard with her is brutal.

The ronin are great in melee and decent with shooting, I personally prefer them over taking the basic freikorman.

Also I personally don't like jack daw with the viks, it doesnt seem to have much synergy with the crew. I'd prefer to spend those 9 soulstones on other things.

The other posters also have alot of good advice. Probably the best thing is to just play around with different lists until you find one you enjoy the most.