Whereas Mask generally dislikes Alphys a lot, Masque is relatively more chill. She doesn't like Alphys because of what she had done to Mask in the past, but Masque holds the belief that they can be good if they just try.
Where Mask's powers end, however, is where Masque's begins. She doesn't mind a justified genocide (clobers for example), but she will bring people to justice and deal with Mask as well. She's heard of the other ocs, would like to meet Hex (genocide related stuff... don't ask me, ask her), and loves any bladed item. Be careful.
Masque is the only one who has ever physically hurt Mask. And it was with a newspaper no less.