Kopa

Kopa is the non-canon son of Simba and Nala, the grandson of Mufasa, Sarabi and Sarafina, the great-nephew of Scar and a main character in The Lion King: Six New Adventures books and two German audiobooks Friends for Life and Fight for the Throne.

He doesn't appear in The Lion King II: Simba's Pride as he is not an official Lion King character, instead he is replaced by his official sister Kiara. In The Lion Guard, Simba and Nala have an official son named Kion, thus disowning him once again.

Appearance
Kopa greatly resembles his father when he was a cub but with slight differences. Kopa is stockier, has bushier eyebrows, lighter fur (which he gets from Nala) and has a tuft of brown hair on top of his head.

The Lion King: Six New Adventures
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Trivia

 * Kopa may be the cub of Simba and Nala in the end of The Lion King. However, this may not be true, as Kopa is not a canonical son of Simba and Nala.
 * Kopa may have been the inspiration for Kion, the official son of Simba and Nala.
 * Both have light yellow fur.
 * Both have hair tufts. However whilst Kopa's tuft was brown and sweeped forward, Kion's is red and is sweeped back.
 * Both have also befriended a hyena (Ashante and Jasiri).
 * Both are enemies with a vulture (Chewa and Mzingo).
 * Phil Weinstein, the storyboard director of The Lion King II: Simba's Pride, admitted during an interview that he had no knowledge of Kopa during production for the film. This could be a reason as to why Kopa is absent from the film and was replaced by Kiara.
 * Alex Simmons, the author of The Lion King: Six New Adventures, confirmed that Kopa was never truly affiliated with Disney and was solely his creation with Disney's label.

The Lion King: Kopa's Story
In The Fourth Lion King Film, Kopa Is Shown And It Tells About The Adventures Of Simba's First Born.