[quote="juhouh"][quote="TheLionPrince"][quote="juhouh"]Scar cannot the one since Nala hates him and didn't care about his death. They have nothing similar anyways. Nuka is the only cub of Scar since he did even admit it in SP. Mufasa cannot be the one either because of Simba talks to Nala about HIS father.[/quote]
Nuka is not Scar's son. A few years ago, the director of
Simba's Pride confirmed that Zira was not Scar's mate therefore neither Nuka (or Vitani) are Scar's offspring.
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What I've heard Zira was just a step mother of Nuka. She found him and took care of him. There have been a discussion about Nuka's mother too... But after all this is a big mystery

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You're entitled to believe what you want, but what you may have heard is just a fan theory. There's little to nothing that indicates Zira is a step mother of Nuka. When Nuka died, Zira mourns over him even stating "Oh, Scar, watch over
my poor Nuka!" The "my" in that line strongly indicates Nuka is her son by blood.