The "cute girl doing cute things" trope has been used to much they desperately try to put a new spin in it, and since monster girls work pretty well…

Basically, The Legendary Tae Yamada there still has the brain of a zombie, although she occasionally does human things like this (She still can't talk or understand people).

The rest of them are normal girls after Episode 1, although they still lose their bodyparts, dislocate their spines and otherwise simply have their body cracking every time they move constantly.