Ha, that's it.
Thanks, helped a lot

Tanabi is a fan made cub son of Simba and Nala. He was created first by a man named Joshua C Templin, who used his said character in an old Lion King fanfiction saga known as The Tales of Tanabi.

Then the name, not Mr. Templin's character, but the name was used again as another version of Simba and Nala's son in The Chronicles of the Pridelands by John Burkitt and Dave Morris.

Since the name isn't copyrighted to anyone, anybody can use the name as their own version of a cub for Simba and Nala. Many people do this. Kopa has nothing to do with Tanabi, as the two are different characters, despite that they are used as Simba and Nala's son.

So, he is just a fan cub, not an official character in the movies or the books.

As Kopa?

he was orginaly made to be simbas cub but hes nothing more then a fan cub

I understand, but it has something to do with Simba, Mufasa?

he is a fan cub