Kovu/Vitani's Lion Guard
So, we know Scar (or Taka as he was known back then) was once the leader of his own Lion Guard. He even had the Roar of the Elders to prove it. BUT, he used the Lion Guard to try and overthrow his brother Mufasa. When his team refused to help, Scar used the Roar of the Elders and killed them all...
But now, his lover Zira is the queen of her OWN pride and her own lands: The Outlands. Do you think we'll eventually see Kovu or Vitani as antagonists in the current show? One of the the two cubs could form there own Lion Guard to take on Kion's.
Think about it, Kovu or Vitani would have access to their own Roar AND be able to call on Scar for guidance on how to assassinate Kion, his sister and mother, and more importantly...Simba...