A skin for my main, I love you. <3
I really love the stun passive idea! Only thing I could say about it would be that her passive indicator is too visible. In-game, it's a very subtle white swirl that turns around her. Here, it might be a bit too obvious. It's also good to differentiate her passive indicator from the "stunned" indicator a bit more, though I wouldn't worry too much about it.
For the AOE, I could really see a "wave" filling the shape a bit, as to make it a tad more visible.
Of course, not as bright as this, and not as plain, but you get the idea.
The particles are nice !
For her colors, I could see something a bit fierier, with less pinks and hotter orange. Maybe something more along this line?
Maybe adding some darker elements could fit since she is the Dark Child. I could actually see her using a dark purple scheme for it, like her goth skin.
I cannot wait to see what you're gonna do next. Her shield, her Q....... And Mecha Tibbers? :')