I like Mufasa as an example of the perfect character. I wish he hadn't died.
Simba is by far the most interesting character. Although I've never experienced anything tragic like that, I most certainly can relate to him, especially with his epic struggle between responsibility and laziness.
As far as villains go, Scar is rather awesome. I love to hate him.
Zira reminds me of my grandma. She's nuts.
Kovu is one of my favorite characters, mainly for the same reasons as Simba. Definitely very interesting.
And then there's Nala. If she was a human, I'd totally... nevermind.
