Chain Reaction: This quirk allows her to create chemical reactions out of "chains", which are different elements in the shape of chains. The quirk protects her from chemicals, but not the aftermath of them. In other words, she'll be protected from toxic fumes, but won't be protected if an explosion is caused. The protection also wears down over time and she needs to replenish her energy after excessive use. The chains can also break, releasing whatever element was inside. This quirk can be very toxic when she is not actively controlling it. In order to use it safely, the user needs knowledge of the periodic table of elements, otherwise the chains will break when formed and release toxic gases.
Before anyone asks, Kaiya W. and Kaiya M. use different pronouns and have different orientations.