Letty Whiterock is a yukionna from Touhou Project. She first appeared as the boss of Stage 1 in Perfect Cherry Blossom.
Letty is often cold towards humans that she meets, and humans often fear her because she is known to freeze them. In Perfect Cherry Blossom, she is attacked by the heroines because of the extremely long winter (who later discover that Yuyuko Saigyouji and Yukari Yakumo were the real culprits).
Nenmin's version of Letty is more typical of Touhou characters, with a heavy emphasis on projectiles and moving around in the air. She is extremely floaty while airborne, and like (ﾟ∇ﾟ)'s version, is slower than the average character in terms of attack speed. Because of her slower attack speed, she excels at keeping opponents away, but struggles at forcing them back if they are already close due to her fragility and limited close-range options.
Although she has A.I. present in her files, it is surprisingly weak.