While developing a script or a movie, creators have to get rid of a character or no longer see the need for it. Or the character evolves into something better.
Little Mermaid
Ariel not only had Flounder and Sebastian, she also had a dolphin friend. Breaker the dolphin's personality was then implanted into Ariel.
Beauty and the Beast
Belle was supposed to have a cute little music box who didn't speak but had music. He was replaced by Chip. He does appear in the movie next to Lumiere before the villagers attack the castle.
http://fancysomedisneymagic.tumblr.com/post/3922625605/unused-disney-characters
Aladdin
Aladdin's mom was once in the movie and Aladdin had a song called "Proud of your boy", a song that Clay Aiken even sang at one point in time. She was removed from the movie and Aladdin was made an orphan. It returned in the Broadway show. Also, there was to be another genie, one in a ring that Jafar would use. Rumored voices were Jim Carey and Lily Tomlin, unknown if they were actually asked.
http://disney.wikia.com/wiki/Aladdin's_Mother
http://disney.wikia.com/wiki/Genie_of_the_Ring
Before Jeffrey Katzenberg's "Black Friday," Aladdin had three human friends called Babkak, Omar, and Kassim. "One Step Ahead" was originally written by Howard Ashman and Alan Menken as "Babkak, Omar, Aladdin, Cassim" and was deleted. They came back in Broadway's Aladdin. Cassim's spelling was changed because Aladdin's dad was called Cassim in "Aladdin and the King of Thieves."
Aladdin
Aladdin's mom was once in the movie and Aladdin had a song called "Proud of your boy", a song that Clay Aiken even sang at one point in time. She was removed from the movie and Aladdin was made an orphan. It returned in the Broadway show. Also, there was to be another genie, one in a ring that Jafar would use. Rumored voices were Jim Carey and Lily Tomlin, unknown if they were actually asked.
http://disney.wikia.com/wiki/Aladdin's_Mother
http://disney.wikia.com/wiki/Genie_of_the_Ring
Before Jeffrey Katzenberg's "Black Friday," Aladdin had three human friends called Babkak, Omar, and Kassim. "One Step Ahead" was originally written by Howard Ashman and Alan Menken as "Babkak, Omar, Aladdin, Cassim" and was deleted. They came back in Broadway's Aladdin. Cassim's spelling was changed because Aladdin's dad was called Cassim in "Aladdin and the King of Thieves."
Lion King
There was Meethu ("Mee-Too"), Nala's brother had a desire to tag along with the two older cubs and their other friend, a bat-eared fox. After Scar’s coup, Nala would’ve been tasked with protecting her brother from Scar. The development of characters like Timon and Pumbaa rendered a second group of friends for Simba not needed.
Pocahontas
Believe it or not, Pocahontas had another friend in a turkey. Redfeather the turkey was replaced by Meeko.
Mulan
Mulan had two dragons named Yin and Yang instead of Mushu, then it was a dragon and a phoenix, eventually they were canned for Mushu.
Muppet's Treasure Island
Amazonia the Parrot was Black Beard's female friend. Apparently Black Beard's Parrot friend was too flirty and female, was changed to Stevenson (above) who appeared in a CD-ROM game and he was ditched for Polly the Lobster.
Bambi
Bee was an insect that was taken out of Bambi, no reason given.
Not only the bee, but Thumper's dad was booted too. Mr. Hare is referenced in the movie but never seen but he was to be included, as he was in the original book. In one early draft of the script, he is constantly trying to tell Bambi a story, but keeps having to run off to avoid a fox before he can finish. He was to die as well. Thumper replaced him because of a cute child actor.
Snow White
In the original Snow White story, the dwarfs all had generic names and no defined personalities. Disney gave them names, but there were some that were unused. Deafy, sometimes written as 'Deefy,' he was hard of hearing. Story drawings of Deafy still exist, proving that he was a more serious contender for a role in the film than other suggested dwarfs like Thrifty, Burpy, Wheezy, Jumpy, Baldy and Awful (steals and drinks and is dirty). Sneezy did replace Deafy. In Once Upon a Time, an 8th Dwarf has been added named Stealthy. http://thefw.com/lost-disney-characters/?trackback=tsmclip
In the original Snow White story, the dwarfs all had generic names and no defined personalities. Disney gave them names, but there were some that were unused. Deafy, sometimes written as 'Deefy,' he was hard of hearing. Story drawings of Deafy still exist, proving that he was a more serious contender for a role in the film than other suggested dwarfs like Thrifty, Burpy, Wheezy, Jumpy, Baldy and Awful (steals and drinks and is dirty). Sneezy did replace Deafy. In Once Upon a Time, an 8th Dwarf has been added named Stealthy. http://thefw.com/lost-disney-characters/?trackback=tsmclip
Alice in Wonderland
Gryphon and Mock Turtle were in the books and they were planned characters for the movie but they were probably cut for time, which is funny because Alice in Wonderland is one of the shortest Disney animated features. Gryphon and Mock Turtle were actually used in a Black and White Jell-O commercial and it looks like they reused some cells from the planned canceled scene and some cells of Alice from the exact movie and just put new voiceovers for Jell-O.
The Rescuers
Among the ideas considered early on was a story where the mice rescue a bear trapped in the zoo. Very little has been written about this version of the film, so not much is known about Louis the bear. Louis Prima (King Louie from ‘The Jungle Book’) was slated to voice him. Walt Disney’s death in 1966 may have weakened enthusiasm for the bear in the zoo storyline and also that Louis Prima had a brain tumor.