To my knowledge none of the KS mods allow you to create your own animations for Juni. I looked into it, but Multimedia Fusion, the engine KS is built on, is designed in a way that makes this very difficult to achieve. You could easily change the Juni animations with Multimedia Fusion, but the current price is $119USD, $85USD for students.
I left user created player character animations out of my unreleased mod, because I was afraid my approach would cause a performance loss. GrayFace intended to have graphics replacing capabilities in his mod, KS Ex, but I don't know what success he's had or if it would work on Juni. I didn't see it in the feature list though.