Nue is a creature who has the ability to make its true form unknown. It is said that she can change forms, from animals, to youkai, to clouds and bubbly orbs, she uses this ability to do whatever it likes, scaring humans along the way. Later, she got bored of it and tried doing something else. She placed the seeds of non-identification(which looked like UFO) in some fragments of Tobikura. She along with Flandre and Koishi are in the same boat of being an EX-Boss

EDIT 9/28/09: I.. JUST BEAT BYAKUREN ON NORMAL!! ISNT THAT GREAT?!

She's from the game Touhou 12: Undefined Fantastic Object
Extra stage BOSS

Nue Houjuu - Toho (c) Zun
Art (c) Ayakohi

Patchouli Knowledge
Aya Shameimaru
Sanae Kotiya
Utsuho Reiuji
Nue Houjuu
Tenshi Hinanawi