Youma Papillon cosplay from Sailor moon (season 1 episode 42)

"Papillon was a Youma created by Kunzite from Katarina. She took the form of a woman who appeared to be half butterfly, with insect-like eyes on the top of her head, antennae, and butterfly wings protruding from the sides of her head. She also wore the same necklace that Katrina had in her human form.

She could summon a swarm of butterflies to attack her targets, or shield herself from attacks. She could also transform her arm into a scythe, as well as fly with the wings on her head. She saw Sailor Venus and Sailor Moon transform, and thus found out their true identities, and later followed them to a ship after chasing the disguised Usagi.

She was healed by Sailor Moon after a battle with the two Sailor Senshi."
- Taken from WikiMoon.org