Yuuka Kazami

Yuuka Kazami is the final boss of Touhou Lotus Land Story and a minor antagonist in Phantasmagoria of Flower View. She is a youkai that lives in Mugenkan, which is the name of her mansion in the Dream world. This youkai was the culprit of an incident regarding a surge of evil spirits. She loves flowers and has the ability to manipulate them.

History
In Lotus Land Story, a horde of evil spirits began wrecking the Hakurei shrine; Reimu, the shrine maiden, suspected they were coming from a lake in the mountains behind the shrine. Hidden beneath the lake was the boundary between Gensokyo and the Dream World. Yuuka was tracked down by Reimu as the source of the evil spirits invading the shrine. Marisa, wanting to join in the fun as well, is able to battle her in her scenario too.

In Phantasmagoria of Dimensional Dream, being a flower fanatic, she did not want the incident to be resolved.

Trivia
Yuuka is portrayed in Touhou fandom as being a sadistic, heartless character.