Bakuu (a Touhou LW original) refers to the early summer rain that falls when barley ripens for harvest. This is an apt temperament for Suwako, who bestows bountiful harvests as a god of the mountain. Suwako's original temperament was Earth Phase (strong against Fire Phase but weak to Wood Phase) and Moon Essence (strong against Sun Essence but weak to Star Essence), but she has lost her earth god temperament (Earth Phase), and it has been replaced with water god temperament (strong against Water Phase).

The ability of Suwako Moriya from the world of iron and steam (a Touhou LW original). Those who reside in the world where mountain resources are converted to power have formed their own unique civilization. Suwako's ability doesn't appear to have changed much, but she seems to have used it extensively to establish the civilization she's a part of. This world's Kanako and Suwako are gods of ironmaking, more so than they are in other worlds. It's often overlooked, but the Great Suwa War is said to have been a war between two different ironmaking techniques. It's theorized that the people who lived in the land of Suwa could have been making iron since the Jomon period (between 14,000 BC and 300 BC). If true, they would have done so by smelting bog iron. Bog iron is formed by iron-oxidizing bacteria interacting with iron-bearing groundwater, though in Gensokyo, they probably understand it as bog iron appearing thanks to some mysterious or divine power. Iron-oxidizing bacteria mainly live in grass-like plants, such as reeds, so perhaps the people of Suwa first discovered iron by collecting reeds growing near a pond or lake to use as fuel for a long-lasting bonfire. Or, perhaps, it was a god, like Suwako, who first blessed humans with the knowledge of iron. Humans constantly develop new technologies over time, with new technologies replacing old ones either by choice or the forceful influence of other cultures. In Japan, this can be seen with the "enlightenment" and adoption of Western culture during the Meiji era (1869-1912), as well as the nation's attempt to adapt to a new level of civilization following Japan's defeat in the Second World War. Regardless of whether these changes were good or bad, they resulted in most old traditions being forgotten or reinterpreted based on foreign ideas and philosophies. However, this isn't really anything new for Japan or any country, for that matter. The same thing happened when Buddhism, a foreign religion, was promoted in Japan by Prince Shoutoku. History always has a way of repeating itself. Gods like Suwako are incredibly ancient, probably even predating the Jomon period. They have long watched over humans, helping their civilizations grow. They watched as humans repeatedly discarded the old and embraced the new. When humans recklessly dig deep into the mountains out of their greed for iron ore and cut down whole forests for fuel, it is the duty of gods like Suwako to curse them with wind and rain, making the earth slide down off the mountains and bury their fields in mud. These gods must be tired of dealing with the antics of humans by now, so it makes sense that they might want to take the form of children now and again.