User blog comment:Xanneer/A change in semblance./@comment-24911350-20140604233420

I think the emotion one is a bit far from the concept of yin and yang to be able to stick. It's about opposite things being connected and leading into one another, but the only thing it takes from that is the idea of opposites. They both benefit Yin Ying with no drawbacks, and the polar nature of something like that being tied to emotional states would make overly-convenient switches to suit the situation very possible.

The one about altering the fluexibility of her body is much more suitable, but might have some minor problems. For instance, if she was squished by a boulder while we was all slug-ey, all her internal organs would be flattened. This wouldn't be an issue on a surface level because I'm assuming her organs would become all rubbery too, but some organs need some space. She wouldn't be able to breathe because her lungs can't inflate, and she'd void her bowels every time. Similar issues would happen if she became super hard. If you can come up with a way to get past those issues, then I think you've really got something good there.