Mata Hari is one of the Witches invited to the Walpurgis, holding the title of "Secret Witch." Her desire is currently unknown. She appears to be a calm person and has a habit of keeping memorabilia from her missions.
Mata Hari was born in the Netherlands, her real name being Margaretha. She was a popular dancer and spy, performing all over Europe, during World War I and spent her last years in captivity.
(Source: Majo Taisen - The War of Greedy Witches Wiki)
Content compiled by AnimeList.moe from publicly available sources.
