I don't mind Zazu in the first one. But in the SP, he just has nothing to do. He's just there because he was in the first one (but that is like a lot of the characters: Nala, Timon, Pumbaa, Rafiki. They were only there because they were in the first film).
In SP, I don't like Nuka, for the reasons listed previously. But I did feel sorry for him when he died, all he wanted was Zira's approval
Vitani... I really don't like her. She just seems to involved with Zira's plan to have changed to Simba's side that easily at the end. I mean, she looked like she was all ready to kill Nala when they fought, but then she changed sides so quickly.
I do quite like Kiara, but she I can only handle her in small amounts. After a while she becomes too annoying. Her whining and complaining.