K’aili is ridiculously stingy with his alchemical ingredients and whatever medicines he creates with them. They are kept in locked cabinets and he slaps hands of anyone who tries to borrow some. He does not give out more than what he thinks is necessary to patients. And he counts and recounts capsules and lozenges to make sure they’re all still there.
Sumire has a bad habit of being a bit too servile. She was raised by parents who intended for her to eventually be a proper wife and she hasn’t quite gotten out of her head the stereotypes she grew up with. Luckily her husband is good at gently reminding her they have a partnership, she isn’t his servant. This habit is slowly changing, but she falls back into it a little too easily.
Yseulte... is a hot mess of bad habits. She’s loud, obnoxiously loud, and feisty. She drinks too much, too often, and she has a mouth on her that’d make a pirate blush. But really, it’s the sum of her bad habits that makes her who she is. She isn’t likely to change anytime soon.