I would love to see Kovu and Kion spending some time together. In this image, Kovu is teaching Kion how to hunt like a professional just like he did with Kiara. I imagine that Kovu and Kion could be great friends and that Kovu would treat Kion like a younger brother or something like that.
I also "re-did" Kion's appearance to something that resembles Simba and Mufasa.
Kion, Kovu, Original image (C) Disney