|First Appearance||Shikigami no Shiro Nanayozuki Gensoukyoku|
|Role||Supporting Character, Antaginist|
Tsukiko has long pale violet hair, and similarly-colored eyes. She wears a collar with a golden key attached to it, a black kimono with lavender insides and large sleeves, golden shoulder pads with red ribbons, a large red band, and several belts and chains.
Tsukiko is a childhood friend of Kohtaro Kuga's, betrothed to him at an early age. She has been bedridden in a hospital for many years. The depiction of her in Shikigami III is likely not her, but a recreation based on the dreams and thoughts of the Castle's visitors.
She also has a key role in Shikigami no Shiro Nanayozuki Gensoukyoku, released before the third Shikigami title, though she acts much colder here.
The final fight in Shikigami III is a thorough affair. Tsukiko has a total of four final forms. The fourth form takes the longest by far. It consists of a lengthy firefight with the exterior of what's best described as a massive living battleship, which resembles Tsukiko naked, attached to a large fetus with multiple eyes.
- Welcome to the Castle of Nightmares. I'm your greatest nightmare.
- Let reality crush you.
- Perverted much?
- Like Roger Sasuke, she weilds a sword. This can possibly be her Shikigami, or the source of its power. However, when she transforms, the sword is no longer visible.
|Protagonists||Kohtaro Kuga · Sayo Yuuki · Gennojo Hyuga · Fumiko Odette Van Stein (Chibi) · Kim Dae-jeong · Niigi Gorgeous Blue · Roger Sasuke · Emilio Stanburke · Batu Harai · Mihee Kim · Reika Kirishima · Nagino Ise · Munchausen · Tagami|
|Supporting Characters||Sazae · Neko · Moonsong · Devourer · Strider|
|Antagonists||Aku Miyoko · Juu Fujishima · Aku Hiroshi · Aku Bauman · Shoujo · Arala Cran · Anolegos Dundeon · Ajo Brothers · Yukari Horiguchi · Shintaro Kuga · Shikou Mibuya · Freedom Wind · Kagachi · Tsukiko Johjima|