Chromas
It is one of the contributing factors of fighting games to have color schematics available for personalization.
From King of Fighters, to Street Fighter. From Marvel Cross-over Sereis to the Super Smash Brothers series....
The ability to fly color schematics on each individual character gave each player an individual identity of sort based on color preferences.
https://media.eventhubs.com/images/sf3/char_akuma_colors.png
You would win so much!
I have noted that the characters in games with the most personal customization options available always tend to be the most popular due to the presence of personalized cosmetic options.
Every successful Character Selection game has ways of personalizing appearances in some way, but the best seem to be the most simplistic options, such as Chromas or Alternate colors.
So in conclusion, I feel that it would be in EVERYONE's best interest if you continued the goal of getting a Chroma set for every champion, with at minimal 1 color variation (Taking the example from Championship Ashe).
This was a really popular reskin before Pulsefire was released. As another example. https://ddragon.leagueoflegends.com/cdn/img/champion/splash/Ezreal_3.jpg