Windmill Girl is a placeholder name for the unnamed girl who helped Lucas escape from Archduke Lewis at Goldy Pond. She gave him shelter at the windmill she was living in. She died five years later out of sickness.
Not much is known about her past apart from the fact that she found a severely injured Lucas which she saved from Archduke Lewis. She took him home to the windmill she was living in and lived together with Lucas until her death 5 years later, out of sickness.
She appeared to be a short girl with white hair and brown skin. She wore the typical clothes most children wear in Goldy Pond.
Not much is known about her personality but it is implied that she was a kind woman who was willing to save Lucas and share her shelter with him.
The unnamed girl was first mentioned by Lucas to Emma for being the one who saved him when he was in trouble. She took him to the windmill she was living him and lived together with Lucas for over 5 years until she died out of sickness. The following eight years, Lucas lived alone in the windmill.
She became friends with Lucas in the five years they lived together.