arianna's dad is the duke of caledonia. we know he's alive and takes an active role in city planning, which is more than we know about her mom. the only thing we can really extrapolate any kind of personality traits from is that he was complicit in sending arianna off to high lagaard without knowing what she was actually in for.
lala's dad is named toto and I'm pretty sure he gets less screentime than dorothy gale's dog but he does actually appear in person! he is apparently a really good computer programmer. he isn't very good at being lala's dad but he made a sincere effort.
dark dream has one ambiguously gendered parent who accidentally killed her but was going to intentionally kill her anyway once they were done with her. f minus tier.
>society has no concept of math