feeling twtptflob-pilled so here's some random, meaningless headcanons!!
achille has a tooth gap (and by extension so does nyx)
no idea if noel had any mentioned parents but i always thought his died when he was young and so he grew up pretty isolated since his only guardians were busy doing political stuff, all until he met dante and got (very unhealthily) attached
luzak's (luzark??) gynophobia was caused by a past nanny of his
dion has trouble speaking post his fight w lante so he prefers not to, and when he does his voice is rlly raspy and hard to control (mf got his throat slit fym there weren't any damages after??)
pandora went from crush to crush after crush not knowing why she couldn't seem to attach herself to any of the men she met until she finally came to the conclusion that she actually likes roxana, after which she spent days just sulking in her room (womp womp roxie already has cassis)
jeremy's screeching can attract cats, mostly because he unconsciously sounds like one
all agriche siblings w red eyes are on some level sensitive to bright lights
dion can attach and re-attach his arm whenever, so if he sees the point in it, he Will hit someone with it
roxana and sylvia like to go flowers picking often, sometimes cassis and jeremy will join
i feel like if any of the siblings could control insects in some way (besides roxana) their assigmed one's would be moth (dion), dragonfly (jeremy) and firefly (achille), but that's just imo