Gloomy

"'A spirit found in swamps and other grimy places. Its stench is truly unbearable.'"Boo, also known as Gloomy, are mean-spirited, poison seirei who are recruited by giving up a certain amount of Shibina tails. Boo can be selected as the starter Hero/Heroine element for a beginner difficulty. Cabernet Cheaptrick also uses the poison seirei. Its special power causes additional damage from poison.

They appear as a bottle of purple liquid in-game.
 * Beats: Powder
 * Fears: Air, Nirva