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Ghost uses sign language and Hollow writes what they want to say down! Hollow is completely mute and Ghost is nonverbal most of the time.
Hollow is often regarded as the "oldest" sibling, even though they're basically the same age as Hornet and Ghost.
The dreamers are all best friends, but Herrah and Monomon often start joke-bullying Lurien because he's a manlet and a Pale King simp. I honestly can't blame them.
Grimm was a hardcore theatre kid. He never grew out of it. He's seen way too many musicals to count, and if he existed in the real world he'd probably know the lyrics to every Hamilton song.
Pale King used a good chunk of Hallownest's tax money to pay for the purchase and installment of his buzz saws.
The Seer is a witch! If she were a real person, she'd have a shitton of tarot cards and crystals, as well as many, many books on spells and rituals.
Sheo is really skilled at makeup and face paint. I don't really have much to add, but it's a bit unsurprising considering he's an artist.
That's all for now! I may add more but idk