Madame Helen Acronaiss (ヘレン・アクロネス Heren Akuronesu?) is a member of SULFUR. She assists King Anthony in finding the Wind Millennium Gummy in Puffoon. She later fights skillfully in Diavolo's War. After the Reconstruction of the World, she marries Nicola Burimadre.
Helen is derived from the Greek "Helene", which means "torch".
Acronaiss is a portmanteau of the prefix "acro" and a corruption of the last name "Onasiss".
Burimadre contains "madre", which is Italian for "mother".