Aaaaaa I really like the idea of them being family friends. ;u; A shared history like that might explain a willingness to overlook Clem's past rulebreaking to some extent (although Nia would totally be an ass about dresscode violations and would probably bug Clem to study with her). They seem like they'd get along well and might be bad influences on each other re:risktaking. Yay for children creating feedback loops of dangerous behavior.
Ari - Nia can definitely respect Ari's desire for comfort and game recognize game so she probably likes Ari since she also seems to be part of the emotionally constipated club. I'm betting Nia likes her.
Reece - Agreed! Nia would relate well to the fact that Reece is pragmatic. Also she will cry crocodile tears when they get back from spring break and his beautiful hair is gooooneeeeee.