Full name: Reimu Hakurei. Female. 13-14 years old. Likely around 15 years old.

Full name: Marisa Kirisame. Female. 12-13 years old (Kid). Speech style: Ends sentences with "da ze" or "da ro." Likely around 15 years old.

Full name: Sakuya Izayoi. Female. 16-18 years old.

Full name: Remilia Scarlet. Female. Over 500 years old.

Full name: Youmu Konpaku. Female. 14-15 years old.

Full name: Yuyuko Saigyouji. Female. Age unknown.

Full name: Alice Margatroid. Female. 15-16 years old.

Full name: Patchouli Knowledge. Female. 17-18 years old.

Full name: Aya Shameimaru. Female. 1200 years old.

Full name: Yukari Yakumo. Extremely long-lived. Female.

A very powerful yokai who manipulates the boundaries of Gensokyo.

Species: Yokai (Sage of Gensokyo) Ability: Manipulation of boundaries Position: One of the "Sages of Gensokyo" Role: A key figure who manages and maintains the boundary between Gensokyo and the outside world. Personality: Elusive, hard to pin down, intellectual, and quite the strategist. Shikigami: Ran Yakumo, and Chen as Ran's shikigami. Relationship with Reimu Hakurei: Fellow maintainers of Gensokyo; Yukari sometimes helps or utilizes Reimu.

Crucially, her "boundaries" aren't just spatial; she is said to be able to interfere with conceptual boundaries as well.