There are over 50 movies based on the Oz books & the two most popular couldn't be assed to actually follow the books. The closest I've seen to following the books is the two anime series, a movie based on Ozma from the 60s, & Return to Oz; which smooshed 2 books together but pulled it off way better than Queen of the Damned could have ever hoped to.
Oz: aka Oscar Z. Diggs is supposed to be a dwarf, midget, vertically impaired. He's also bald. He was old when he arrived 7 he stopped aging when he got there. It was also initially suggested that He & the witch Mombi got rid of the king & he had the witch turn Ozma into a boy & wipe her memory. He has no love interest, ever.
Glinda is supposed to be kind of a badass, & she only wears red. She's queen of the Quadlings. She has a rather mysandristic military made up entirely of female soldiers. She's the most powerful sorceress on Oz & taught Oscar his magic tricks. She has no love interests either.
There are only 2 good witches. The Munchkin Witch was not one of them.
Dorothy: A bitchy, insistent little girl with short blonde hair. Takes great pleasure in telling people they're wrong & correcting them. Not afraid to throw a punch. Eventually gets her aunt & uncle to move to Oz.
The nameless elderly white-clothed munchkin witch from the land of the Gillikins was given the name Glenda & made taller in the MGM movie.
Tin Woodsman: Nick Chopper, a flamboyant narcissistic android/ghost-in-a-shell.
Scarecrow: an idiot who thinks he's a genius. At least he's smarter than Jack Pumpkinhead, whom influenced Jack Skellington.
Cowardly Lion: A lazy violent bully with low self esteem who only thinks he's a wimp.
Billina: A talking chicken.
Tik-Tok: A surprisingly emotional& thoughtful robot who insists he neither feeks nor thinks.
Nomes: The only real reoccurring antagonists, but too stupid to be of any real threat.