Rin Satsuki was the third playable character of Embodiment of Scarlet Devil. She was thrown out during production due to time constraints, but still managed to leave a trace in the source code. If you do a text search of the EoSD data files, you can find the name "冴 月麟" (Satsuki Rin) near the other playable characters. Associated with her are the attack types 花符 (Flower Sign) and 風符 (Wind Sign). A portrait of a "Poster girl" (whom is also seen in one of ZUN's artwork on his old site) appears on Team Shanghai Alice's circle ad in the Comiket when EoSD was first released, and had been long said to be allegedly Rin Satsuki.