I'm currently trying to make a build that relies on Sayu's Fuufuu Windwheel state to create elemental reactions (for example, using Furina's Salon Members in Ousia state to apply Hydro and using Raiden's Eye of Stormy Judgment to apply Electro with Sayu's Fuufuu Windwheel).
This got me thinking: How can I reliably apply an element to Sayu's Fuufuu Windwheel? So far I know that Raiden's Eye of Stormy Judgment can be used to apply Electro, but what about the other elements?