Fighter makes Xayah sound like she is suppose to be a tanky-damage dealer when she is a full damage ranged champion, hence being a marksman. So I say just remove the fighter portion and just have her as a marksman within the champion description area.
Also brighten her feather resource bar slightly to be slightly more visible.
Rakan is accurate as a support/mage. But mirroring his splash art so he is on the right side may be smart to emphasize that he is the champion you are playing as (and not hidden behind the ability icons and stuff).