Soul Siphon Kha'Zix
Overview: The entire premise behind this skin is that kha is now able to literally absorb souls into his being (much like it is stated that he can in his lore), except instead of simply evolving an ability into an upgraded version of itself with no variation, it would take on (somewhat) the appearance of a champion that he has killed (and thereby absorbed).
For example, if Soul Siphon Kha killed an Annie, and he had not yet slain an enemy previously, his passive would change to somehow look like Annie had been absorbed into it (his claws would glow red instead of their default color when activated). If he killed her after he had previously slain another champion, his q would have a special animation relating to her (fire would spew out of him like her e ability). This would go on for all abilities and all champions (or most, if unable to intergrade all). Some specific transformations would not affect his abillity’s looks alone, instead they would also add some things onto his model. However this would only apply to a few champions. (example would be absorbing Braum, he would grow a mustache, when he absorbs Ahri he would grow a tale and so on).
Now obviously this is an ultimate skin so it would take a very long time to make. When Kha’Zix slays a different enemy, he has to say a different quote and create a new animation for his abilities, so technically there could be hundreds if not thousands of possible combinations for him. I would be more than happy to help with all of these in any way that I can, and with this document, I am including a series of things that I envision that he may have. I beg you to look into this because there is a lot of potential in this skin that I think you would benefit greatly on, and it would mean a ton to me.
Dance: Kha’Zix does a dance, but then all of the champions that he had slain thus far appear one at a time and do their death animations as he makes his movements, they are then absorbed back into him much like how thresh is absorbed into his own lantern upon his death.
Laugh: Kha’Zix laughs, and avatars of all slain enemies appear at once and laugh (they would appear as shadow images of themselves and have red eyes or something and look possessed).
Taunt: If there is an enemy champion nearby who Kha’Zix has recently slain, he will talk down upon them and say something like “Your soul is mine, you mean nothing now”, but if he hasn’t yet slain the enemy, then he will threaten them and say something like “It’s only a matter of time before you join me”.