UPDATED 11/14/16
"Once Upon A Time" has been running for 5 years on ABC. Season 6 is about 'Untold stories' and many stories have been told, which ones are left? You would be surprised, there are many Disney stories and other literature yet to be told. Many of the characters were tied to either Snow, the evil Queen or Rumpelstiltskin. I'll try to not spoil. About 28 stories have been adapted...
"Once Upon A Time" has been running for 5 years on ABC. Season 6 is about 'Untold stories' and many stories have been told, which ones are left? You would be surprised, there are many Disney stories and other literature yet to be told. Many of the characters were tied to either Snow, the evil Queen or Rumpelstiltskin. I'll try to not spoil. About 28 stories have been adapted...
Characters done:
Snow White and the Seven Dwarves
Character: Snow White, Prince Charming, Eight Dwarves, Evil Queen, Huntsman
Actors: Josh Dallas and Ginnifer Goodwin and Lana Parrilla
Seasons: All
Arcs: All
Part of Original Curse: Yes
Close to Disney Character: No
Snow White is much braver and a hero on her own write. Prince Charming has his own backstory and the dwarves as well. Regina has a huge big backstory different from the Disney movie.
Pinocchio
Characters: Pinocchio, Gepetto, Jiminy, Blue Fairy
Actors: Eion Bailey, Tony Amendola, Raphael Sbarge
Seasons: 1, 2, 4B (Pinocchio); 1-4, 6 (Jiminy)
Arcs: 1, 2 and Villains
Part of Original Curse: Yes
Close to Disney Character: No
Jiminy becomes Archie Hopper, therapist that is a character from Seasons 1-4 in Storybrooke, he didn't appear in S5 and reappears in S6. Their backstories are different as Jiminy is friends with Snow and influenced Gepetto as a kid. Blue Fairy appeared in Seasons 1-2 and occasionally here and there.
Rumplestiltskin
Actor: Robert Carlyle
Seasons: All
Arcs: All
Part of Original Curse: Yes
Close to Story: No
He is a villain and anti-hero. He is Hook's "Crocodile" and Beauty's "Beast." He is even Peter Pan's son!
Little Red Riding Hood
Characters: Red, Granny
Actress: Meghan Opry
Seasons: 1-2, 3B, 5B (Red), All (Granny)
Part of Original Curse: Yes
Close to Story: No
Anything I say about her is spoilery but she was part of the cast in season 1 and 2 as Snow's best friend but slowly got phased out.
Beauty and the Beast
Characters: Belle and Gaston
Actress: Emilie de Ravin
Seasons: All (Belle), Gaston (1 and 5B)
Arcs: All (Belle), Gaston (First and Underworld)
Part of Original Curse: Yes
Close to Disney Character: Yes
Belle is a major character, her father has appeared on Storybrooke and Enchanted Forest. Gaston appeared in S1 flashback and later S4B in Underworld played by another actor. The 'Beast' is Rumpelstiltskin, he even dons the Beast outfit. She has the book love as in the Disney character. Lumiere appears as an ally of the Wicked Witch in Season 3B.
Cinderella
Characters: Cinderella, Prince, Godmother, Gus
Actress: Jessy Schram
Seasons: 1, 4 and 6A
Arcs: 1 and Untold Stories
Part of Original Curse: Yes
Close to Disney Character: Sort of
Cinderella appears in Season 1, Rumple kills her godmother and serves the role. We get more backstory in Season 6 as the original actors for Cinderella and Prince appear along with new actors for stepmother and stepsisters. Gus was a mouse that becomes human in Storybrooke and is later killed. Jessy Schram has only appeared in three episodes!
Hansel and Gretel
Seasons: 1 and 5B (Witch)
Arcs: 1 and Underworld (Witch)
Tied to: Evil Queen
Part of Original Curse: Yes
Close to Story: Yes
Hansel and Gretel are one-off characters and even the witch in season one but the witch returns in the Underworld as a minor character.
Kind Midas
Seasons: 1 and 3B time travel
Tied to: Prince Charming
Part of Original Curse: Yes
Close to Story: No
His daughter Abigail is more important to this story as in the first curse she is David/Prince Charming's wife. The myth is more or less the same, with turning things to gold. King Midas turned Abigal's real love into gold.
Frankenstein
Actor: David Anders
Seasons: All (on and off)
Part of Original Curse: Yes
Tied to: Evil Queen, Mad Hatter
Close to story: No
Dr. Whale appears prominently in Season 1 and 2 and then sparingly guest spots, even season 6. Fans were not fond of Frankenstein being used instead of a fairy tale so maybe why he wasn't used more.
Jack and the Beanstalk
Character: Giant, Jack
Season: 2
Part of Original Curse: No
Tied to: Emma and the Dwarves
Close to story: No
The giant, named here Anton. He only appears in Season 2. Jack was actually female, say in a flashback.
Sleeping Beauty
Characters: Aurora (2, 3, 4), Philip (2), Maleficent (1 and 4B)
Actors: Sarah Bolger, Kristin Bauer van Straten, Julian Morris
Arcs: Season 2 and Villains
Part of Original Curse: No
Close to Disney Character: yes
Aurora has appeared here and there. She and Philip were introduced in Season 2, tied with Cora. Maleficent appeared in flashbacks in Season 1, a dragon at end of Season 1 and reincarnated in Season 4B Villains arc.
Mulan
Seasons: 2, 3, 5
Actress: Jamie Chung
Part of Original Curse: No
Tied to: Sleeping Beauty, Robin Hood, Ruby, Merida
Arcs: Season 2, Peter Pan, Camelot and Underworld
Close to Disney Character: Sort of
We don't really see her Mulan film story but told about it, she kind of plays second fiddle. She even has a crush on Aurora.
Robin Hood
Characters: Robin Hood, Little John, Friar Tuck, Merrymen, Maid Marian, Sheriff
Seasons: 2, 3-5
Actors: Tom Ellis (Season 2), Sean Maguire (Season 3B to 5B)
Part of Original Curse: No
Tied to: Evil Queen
Close to Disney Character: Sort of, human
Robin Hood appeared in Season 2 and later recast to be Regina's love interest. Maid Marian was his wife and she also appeared.
Alice in Wonderland
Characters in OUAT: Mad Hatter, Queen of Hearts
Characters in OUAT:W: Alice, Red Queen, Knave of Hearts (Will), White Rabbit, Caterpillar
Seasons 1, 2, 4, Once Upon A Time: Wonderland
Actresses:
Part of Original Curse: No
Tied to: Evil Queen, Robin Hood
Close of Disney Character: Sort of
Mad Hatter was introduced in Season 1. Cora was revealed to be the Queen of Hearts in Season 2, Alice and other characters appeared in Once Upon A Time: Wonderland. Will, the Knave of Hearts appeared in Season 4 of OUAT and was part of Robin Hood's merrymen.
Peter Pan
Characters: Peter Pan, Hook, Tinker Bell, Blackbeard
Seasons: 2-on (Hook), 3A & 5B (Pan), 3A (Tinker), 3A and 4A (Blackbeard)
Actors: Colin O' Donoghue (Hook) and Robbie Kay (Pan) and Rose McIver
Made own curse: Tried to
Tied to: Rumple, Evil Queen
Close to Disney: No
It is actual role reversal as Peter Pan is the villain and Hook is the hero. Hook has a bigger backstory with Rumple. Tinkerbell is tied to Evil Queen. Silver mist from the Tinkerbell movies appeared in Once Upon A Time: Wonderland.
Little Mermaid
Characters: Ariel, Eric and Ursula (later appears in Season 4)
Seasons: 3A and 4B
Actress: JoAnna Garcia Swisher
Part of original Curse: No
Tied to: Snow and evil Queen
Arcs: Peter Pan and Villains
She appeared in flashbacks and later in Storybrooke. She later returned to her love Prince Eric. She is very close to the Disney version with the name and outfit. Ursula was not close to her disney version.
Rapunzel
Season: 3B
Actress: Alexandra Metz
Part of original Curse: No
Tied to: Prince Charming
Arc: Wicked Witch
Close to Disney Character: No
She only appears in the Enchanted Forest, no romantic interest.
Wizard of Oz
Characters: Wicked Witch, Dorothy, Wizard of Oz, Good Witch of North
Season: 3B, 4B - on
Actress: Rebecca Mader (Wicked Witch)
Part of Original Curse: No
Made own Curse: Yes
Tied to: Evil Queen
Arc: Wicked Witch, Camelot, Underworld, Untold Stories
Close to Original Book Character: No
Zelena, the Wicked Witch of the East is the most prominent character as Regina's sister. Dorothy was briefly seen as a child in 3B flashback and then in 5B. Zelena was introduced in Season 3B and then returned at the end of 4B villains arc and stayed on.
Elsa and Anna
Season: 4A
Actresses: Georgina Haig and Elizabeth Lail
Part of original Curse: No
Tied to: Emma Swan, Belle and Prince Charming
Arc: Snow Queen
Close to Disney Character: Yes
They were part of Arandelle and temporarily came to Storybrooke. They were VERY close to their Disney versions.
Snow Queen
Season: 4A
Actress: Elizabeth Mitchell
Part of Original Curse: No
Made own curse: Yes
Close to Original Story: No
She was the villainess for Season 4A. Her background was tied to Frozen as a backstory.
Little Bo Peep
Season: 4A
Actress: Robin Weigert
Part of Curse: Kinda? Or Maybe the Second?
Close to Original Poem: No
She is more of a lackey here. In the poem, she is a sweet girl, here she is a tyrant.
Cruella De Vil
Season: 4B, 5B
Actress: Victoria Smurfit
Part of Original Curse: Yes?
Close to Disney: No
She was from a fictional world and then ended up in the Enchanted Forest with powers so not like her original counterpart. Pongo of 101 Dalmatians fall under her spell but has been Hopper's dog since Season 1.
Merida
Season: 5
Actress: Amy Manson
Part of Original Curse: No
Tied to: Emma Swan, Mulan
Arcs: Camelot and Underworld
Close to Pixar Character: Yes
She is an original Pixar character and her storyline is like a continuation as Elsa and Anna's are. Her brothers, the witch and McGuffin appear.
Legend of King Arthur
Characters: Lancelot, Merlin, King Arthur, Queen Gwenoviere
Actors: Sinqua Walls, Elliott Knight, Liam Garrigan
Seasons: 2, 5A (Lancelot), Arthur (5), Merlin (5A)
Arcs: 2 and Camelot
Part of Original Curse: No
Close to Disney Character: No
Lancelot appears in Season 2 in Enchanted Forest. In Season 5A arc, we meet Merlin, Arthur and re-introduced to Lancelot, played by the same actor.
Hercules
Characters: Hercules, Hades, Megara, Zeus
Actors: Greg, Jonathan Whitesell
Season: 5B
Arc: Underworld
Tied to: Snow White and Zelena
Part of Original Curse: No
Close to Disney Character: Sort of
Hades is more of the major character, having backstory with Zelena. Hercules and Meg appear in one episode. Zeus appears in another. Megara and Hercules meet the afterlife here, unlike the movie nor the original myth.
Dr. Jeckyl and Mr Hyde
Actors: Hank Harris, Sam Witwer
Season: 6A
Arc: Untold Stories
Tied to: Rumple
Close to Original Story: Sort of
Like Frankenstein, the story originally didn't have much magic but Rumple of course was involved in this version.
Count of Monte Cristo
Actor: Craig Horner
Season: 6A
Arc: Untold Stories
Tied to: Snow White
Close to Original Story: I have no idea
Count of Monte Cristo
Actor: Craig Horner
Season: 6A
Arc: Untold Stories
Tied to: Snow White
Close to Original Story: I have no idea
Aladdin
Characters: Jafar, Aladdin, Jasmine
Actors: Naveen Andrews (Jafar, OUATW), Oded Fehr (Jafar, S6), Deniz Akdeniz (Aladdin), Karin David (Jasmine)
Season: OUAT: W and 6A
Arc: Wonderland and Untold Stories
Close to Original Story: Sort of
In Once Upon A Time: Wonderland, Jafar was the villain and one of the protagonists was a genie. Now in season 6, Jafar has been recast.