As the head of the family, Amuncommon is very stern and commanding, and has little patience for foolishness. She is not a fan of modern music, something Seth loves but has to keep secret from her. She agrees to Ramses de Nile's plan to unite the two families, believing it will be the best decision for her son. After the events of the movie, she accepts that Seth wants to be a musician, now knowing what truly makes him happy.
Amuncommon is a tall, dark skinned mummy with angular features. She wears a black business suit with gold trim, and a Egyptian-style headdress.
Amuncommon's son is Seth Ptolemy. She seems to have raised her son with equal if not stricter regulations as Ramses de Nile has for his own daughters. While she does initially have problems for her son's real likes and personality, in the end she is accepting of Seth's love for music and having a relationship with Catty Noir.
Amuncommon is voiced by Cindy Robinson.
- September 29, 2015: Amuncommon makes her debut in the TV Special Boo York, Boo York.