Vitani is my favorite character! She's so cute with her blue eyes and headtuft. I also like how her design changes as she grows up. She looks scarier as an adult, and I like that. I love her personality; so smart and tough, but still kind and goodhearted. She really loved her brothers. I think that she and Kovu were littermates, but that doesn't mean they had the same father (well, I believe they had the same father, but it's okay if someone doesn't).
I believe that she was loyal to her mother, but Nuka's death made her wonder if the war was right or not.
And about her name. I wonder if they knew that it meant 'ducks'.
But doesn't it mean 'at war', too? I found this from Internet:
"Askari Wetu Vitani = Our Soldiers at War"
Askari = soldiers
Wetu = our ---> askari wetu = our soldiers
Vitani = at war
... right?