Miss Susan Irvine is a fictional character featured in The Witches. In the 1990 adaptation, she is played by Jane Horrocks.
Miss Susan Irvine is a witch who is the assistant to Miss Eva Ernst, the Grand High Witch. She is mistreated and seems to be the only witch with a touch of kindness.
After The Grand High Witch and most of the other witches are turned into mice, she becomes the new witch in charge. She rewards Luke Eveshim and Bruno Jenkins by turning them back into children.