Yukari Yakumo is a mysterious and powerful character from the Touhou Project series, known for her ability to manipulate boundaries. She is a youkai, which are supernatural beings in Japanese folklore, and plays a significant role in maintaining the balance between the human and youkai worlds. Yukari is often depicted as a wise and enigmatic figure, sometimes offering guidance or assistance to other characters. Her personality is playful yet cunning, and she often acts according to her own mysterious agenda. Despite her aloof demeanor, she is deeply connected to her friends and the world she helps oversee.