Since my friend is reading SoC for the first time, thought I'd write some new headcanons!
Joost is reincarnated as Isaac from KoS (they just have similar personalities in my mind)
Inej has a (unoffical) pet crow. She named it Kaz, and she keeps trying to sic it on Kaz whenever she annoys her (it never works)
Kaz keeps "joking" about killing "that bird", but he thinks it's cute how Inej keeps trying to train it to do tricks
Wylan wears glasses that are way to big for his face
Wylan published a book about his adventures w the Crows (with anecdotes from Jesper, ofc)
Kuwei obsessively writes Jesper fanfic
Kuwei heard about Wylan's book and wrote his own (from his own perspective, where almost everything is inaccurate)
Wylan taught Jesper to play piano
Jesper is terrible at it, but Wylan says nothing
Nina develops a craving for fish after parem
Everyone complains about the smell
That's all for now! Lemme know what you think, and if you have any ideas for more headcanons