Larissa Zivonik was a Manticoran citizen and an inhabitant of Sphinx.
She was one of Alexandr and Evelina Zivonik's seven children. During a sledding outing, she was almost hit by a falling crown oak branch, but was saved by her older adoptive sister, Sumiko Uchida, who pushed her out of the way and was killed by the branch. (HHA2.1: TS)