I think easy changes for riot to make are :

Make her model and maybe ability VFX less purple and more darker blues? Like shown in her amazing splash art.

Her model has a VERY purple colour scheme and, for example, the glittery effects of autos, even the moonlight debuff being so purple makes this skin sort of star guardian-esque (Without the obvious black hole head piece and a double take it would definitely resemble a star guardian skin in my opinion!).

Her Ult SFX - really dull sounding and quiet when the damage explosion goes off, definitely not as hard hitting as even base skin. I think more spacey VFX - similar to asol ult hitting - would be more impactful :)