Ehehe ok, some characters from Narwhal's Song:
Sami: she loves to find paranormal explanations for stuff she doesn't understand, and she's very stubborn when people give different opinions on those subjects.
Mindy: she just really likes to be annoying and to confuse people??
Ruma: idk if that counts as a quirk lol, but they're always on phone checking social media or to-do lists, and they also love to micromanage their relatives.
Jeramy: he's the kind of person who quickly adopts the style and habits of people he admires without noticing it, and he doesn't really respect personal space (at first in Narwhal's Song he's a kid so I guess it's normal, but a few years later he'll still have some childish habits...)
Other characters from the same story, but who didn't show up yet:
Myran: likes to pretend he's very relaxed, but gets anxious easily and fidgets with his hair or jewelry. Also likes to talk to plants.
Bastian: he kinda is religious figure, so he really hates doing small "bad" stuff (like forgetting to say thanks) even tho his superiors say it's ok.
Athos: in the same religious position of Bastian, but has a cycle of not caring about behaving badly, then regreting it, then forgetting he that regrets his actions and doing something wrong again the next day. Also very self conscious about his appearence but pretends he doesn't care. Also doesn't talk to anyone before having coffee in the morning. Also can't hold a baby sheep without crying, even if it's just a toy.
Licole: sometimes likes to eat grass (it's a long story...)