Okay hears an idea for a new lion guard speachial. Its called The Lion Guard The Lost Prince. The story will go like this Kion learns that he had an older brother named Kopa. They said he was killed by Zira and she was exiled along with other outsiders because of him. However little did they know the prince Kopa who was said dead is really alive and out there some where. So Kion desides to go on a journey to find out the truth if his brother is really dead or is it just a lie. While Kion left thePridelandes a mysterious male lion is whaiting for him. How that sounds like a good pliot for this spechial so far. I know Kopa isn't an offitial disney charchter. But maybe a petition could make Kopa offitial and as a supporting character in the Lion Guard. He would be the older brother because other say he the oldest out of Simba's children. He would help his brother and his friends in the shadows during hard times.
Noncannon, Leaked, Handy characters for the future, Fan suggestion, Disney and his children sufficiently Kopa would still be fine to meet I haven't seen Kopa myself yet. I'm just a big fan of characters in Mufasa's family and his best friends, plus Kion's friends from anywhere.