>>527948250
She has much better chemistry with Zizka than she does with Henry, but that's just me. In the original promo material she had a crossbow and Rosa was nowhere to be seen, so it's possible that Katherine was originally going to have more screentime or something. I guess we'll never know.
>>527950503
No, you have to pick all of his heart dialogues in order to romance him. If you miss one then the game assumes at that point that you don't want to romance him so the other romance triggers after that will not appear and you won't be able to sex him.