Tani-Kaze (a Touhou LW original) refers to wind that blows through a valley or an eastern wind. This is an apt temperament for this Nitori since she is the host of the shikigami known as Goki, an oni familiar with water. Nitori's temperament (Moon Essence and Water Phase) has combined with Goki's temperament (Water Phase and Metal Phase).

The ability of Nitori Kawashiro from the world reborn (a Touhou LW original). This Nitori's ability remains essentially unchanged, but when she's activated as a shikigami, Goki's power envelops almost her entire body, which seemingly causes her to act like a completely different person. Yukari Yakumo claims to be recruiting shikigami monitors, but she's really searching for live youkai to conduct experiments on. She also claims she's only trying to have fun... but that too may be a lie to hide her true intentions. After all, she's the Youkai Sage. Using the method that allows a shikigami to control another shikigami (i.e., Chen) as a reference, she's created special shikigami magic. That magic has now blurred the lines between different types of youkai. If it hadn't, there'd be no reason for Yukari to have a kappa fulfill an oni's role. The definitions of different sub-species of youkai are vague, and even those within the same sub-species are not always alike. On the other hand, members of different subspecies often have strong connections and many things in common. You could say that it was humans who began naming different types of youkai and that before that, there were no subspecies of youkai. Taking the broadest definition of youkai as "anything non-human," even gods would become youkai. Mysterious flooding or drownings can be attributed to water youkai. If these youkai are revered, they would be water gods, if feared, water oni, and if distrusted, kappa. They could be said to look like anything from humans who lost their lives by the waterside to dangerous animals who live near water, embodiments of water-related disasters, or optical illusions born out of suspicion. They can also be seen as curses, blessings, revelations, or ill omens. It falls to humans to decide how they interpret phenomena, including their causes and effects. Whether Yukari Yakumo knows that or not (although, she almost certainly does), she has the ability to influence their decision-making. Kappa excel at developing advanced technology. Doing so requires access to an abundance of clean water. While developing new tech, everything from gathering wood and minerals to refining metals and cleaning precision equipment necessitates water. The gods that once ruled over iron manufacturing and forging devolved into youkai when their technology was revealed to the world. Once the technology was revealed, it became known that it was comprised of human techniques, and the sense of mystery surrounding it was lost. Nitori was aware that she and her fellow kappa may have once been gods, but also thought that it didn't really matter. However, she had a keen interest in researching technology. She believed if she got lucky, she might be able to glimpse Yukari Yakumo's confounding techniques and replicate them, but things didn't work out as she'd hoped. The memories of shikigami are stored in their tails, which they ordinarily hide. However, kappa and their associated ancestors don't typically have tails, so Nitori was given one made of mino, a type of green algae, not to be confused with the traditional Japanese raincoats also known as "mino." Kappa aren't turtles, but apparently, there's a turtle with mino attached to its shell that lives in the Hakurei Shrine pond. Come to think of it, Japanese "kappa" raincoats and mino raincoats aren't related... are they?