|This article is about a/an Mirror Monster in Kamen Rider Ryuki.|
- Height: 120cm
- Weight: 40kg
- Length: 1.2m
- Wingspan: 1.6m
- Flight Speed: 400km/h
- Misty Slash: Femme's Final Vent; Blancwing blows enemies toward Femme, who slashes them with the Wing Slasher.
Through the use of certain Advent Cards, parts of Blancwing's body can be used by Femme as weapons or other equipment.
- Wing Slasher (ウイングスラッシャー Wingu Surasshā): A double-bladed staff derived from the edges of Blancwing's wings combined together. It is summoned by Femme's Sword Vent card.
- Wing Shield (ウイングシールド Wingu Shīrudo): A shield derived from Blancwing's wings and back. It is summoned by Femme's Guard Vent card.
- In addition, Femme is always seen with Blancwing's torso mounted on her back, equipping her with a cape.
It's name is derived from the French word "blanc", meaning "white", being combined and "wing".