Japanese media website, Animeanime, has recently asked their female users the question: Which anime character do you want to cosplay as for Halloween? The data was accumulated from October 19, 2017 to October 22, 2017.
8 (tie). Mashu Kyrielite (Fate/Grand Order)
8 (tie). Nausicaa (Nausicaä of the Valley of the Wind)
8 (tie). Kaban (Kemono Friends)
8 (tie). Atsuko Kagari (Little Witch Academia)
8 (tie). Rei Ayanami (Neon Genesis Evangelion)
6 (tie). Jeanne d’Arc (Fate/Apocrypha)
6 (tie). Enma Ai (Hell Girl)
4 (tie). Yazawa Nico (Love Live! School Idol Project)
4 (tie). Umaru Doma (Himouto! Umaru-chan)
3. Jirou Kyoka (Boku no Hero Academia)
2. Kiki (Kiki’s Delivery Service)
1. Rem (Re:Zero)
