Serephia, from Skulduggery Pleasant: Last Stand of Dead Men
Picture by u/SelmLelm:
https://reddit.com/u/SelmLelm/
Picture by u/Lobology:
https://reddit.com/u/Lobology
Picture by @adrian_cw: https://www.instagram.com/adrian_cw/ https://twitter.com/adrian_cw
Anime: Lycoris Recoil (リコリス・リコイル)
Serephia, from Skulduggery Pleasant: Last Stand of Dead Men