This is Mitsuki, the twin sister of Mitsuko.
They look exactaly the same but Mitsuki's hair is brown and Mitsuko's is black.
Both these characters where inspired by the game Fatal Frame 2 Crimson Butterfly

When the twins are hurt or feel negative emotions a crimson butterflly will apear on their neck: http://vignette4.wikia.nocookie.net.....20100429024403

at some point I will try to draw or have them drawn together in clothing like this: http://i.ytimg.com/vi/_2Xkq_Fwe_A/m.....resdefault.jpg

Line art made by: © 2014

Character owned by: © 2015