What do you think about the new champions Rakan and Xayah?

I think they're pretty unique because of the new 'couple' system, but it may also be punishable if you ban one of them. Xayah is the ADC and Rakan is a support. Right now, I think Xayah is sort of overpowered since other ADC's have been heavily nerfed. The patch is still new and we'll still have to wait to see how good these champions really are, but I believe a nerf is coming soon for Xayah. What do you think?