Recently I've come to realize that Kiara is in a special position in that she would be the first Princess (at least for a few generations) to inherit the throne to the Pride Lands, as the last few generations of heirs before her had all been male.
However, the announcement of the upcoming film/TV series The Lion Guard, and the introduction of her brother Kion, provides an interesting topic of discussion: Could Kiara possibly lose the throne to Kion?
They are the first known set of male/female siblings in their family, so throne inheritance is unclear. Their father was an only child, so he was the only lion who would inherit the throne. Although the movies imply that the first-born cub gets the throne, it is unknown if that applies to male cubs only. Kion could very well bypass Kiara, and become King of the Pride Lands upon Simba's death, as he is the first-born male (Kopa does not count)
I'm also interested in Kovu's title/position. If Kiara remains as the Crown Princess and isn't surpassed by Kion would Kovu become a King/Prince Consort? Would he co-rule alongside Kiara? Or would he actually take over upon Simba's death (similar to Aladdin becoming Sultan upon the death of Jasmine's father, despite Jasmine being the Sultan's daughter)?
I like to believe Kiara will still be Crown Princess, meaning that Kion would only inherit if Kiara dies without producing an heir. Maybe it will be revealed in Lion Guard, maybe it won't. I'm interested to hear what others think: Will Kiara still become Queen?