Here are the results of the polls.

36) Old hag (Snow White and the Seven Dwarfs)
The character was supposed to be the fairest of her kingdome until Snow White became more beautiful, and jealousy drove her to desperate measures. She ended her days looking like this. Instead of the fairest, the least beautiful among all.

Some comments from fanpop users:

-Mongoose09: old + hag = this thing

-princecatcher93: The face that made me scared of Snow White until I was 15.

-maryksand: Well, this one needs to go because old hag's unattractiveness in terms of looks/outside appearance was the entire point of Evil Queen's transformation in the first place.

35) The Madama (Aladdin)
Although she barely appears in the movie, she's a female character, and not a pretty one.

-Shelendrya: Those Lips are pretty scary....

-BelleAnastasia: So repulsive!

-dancing_dear: Owns a brothel, pretty sure it's a dude in drag

34) The matchmaker (Mulan)
The woman who is supposed to know about couples and feminity doesn't strike as particularly feminine (thought by many to be a man).

-KataraLover: When I was a kid I thought she was a man

-Books_and_Roses: Ugly in and out.

-TheCrystalRing: Ursula at least makes her looks work. The matchmaker, not so much...That's probably why she's a matchmaker; she could find anyone who wouldn't be repusled by her looks.

33) Ursula (The Little Mermaid)
The witch of the sea is not half human half fish, but has an octopus bottom. She's fat, a bit old and also, a villain. Does that influence her image?

-starlight77: Based off of a drag queen. No more comments.

-princecatcher93: Mama Odie is cute. Ursula is this big ugly blob of ugliest.

-MalloMar: ...She's a purple blob. I actually love her design, but it's ugly.

32)Mamma Odie (The Princess and the Frog)
The blind old woman was voted next. She's pure wrinkles, and since we can't see her eyes, she hasn't got much to offer. A debate was generated: does youth equal beauty? Does old age count as reason to vote off in the countdown? I leave the question open. All opinions are valid: beauty after all is a matter of subjectivity.

-BraBrief: A living collection of wrinkles

-milky-way: She looks like my mental picture of Bathilda Bagshot, and that is no compliment.

-fiina: I don't care if she's 197 years old though she looks like 80 or 90 but it really doesn't matter if she looks 100 years younger. She's definitely far from beauty.

31) Grandmother Fa (Mulan)
Taking aside her age, her face is shaped weird and her nose is too big.Mulan's grandmother is usually a popular character, but on a beauty contest she doesn't come off too well.

-magicfairydust: She's hilarious and adorable, probably pretty when young, but not so much anymore XD

-LightningRed: Now she's the least beautiful

30) Drizella (Cinderella)
One of the two ugly stepsisters. Personally, I find her less ugly than her sister, but I think Anastasia's image has been changed due to the sequels, making Drizella the less agreeable.

-rhythmicmagic: She looks very much like she belongs on the cover of The Witches by Roald Dahl

-princecatcher93: She put the ugly in ugly step sisters

-Flutey_Girl96: Her nose is weird...

29) Carlotta (The Little Mermaid)
Just compare the size of her hand with her face. That's all I'll say.

-Mongoose09: It looks like she's got a family of chipmunks living in her cheeks

-princecatcher93: Her butt looks like she sat on a bees nest

28) Anastasia (Cinderella)
Although her hair color is unique, it doesn't look like hair to me.

-Swanpride: Yeah....Anastasia, Drizella, next to no difference, they are both ugly...they are meant to be

-Sirea: She's not really beautiful.

27) Lady Tremaine (Cinderella)
The mother follows the daughters. Her expression is austere (a smile might help her), her hair too big. I'd say she's elegant, but that's all.

-LightningRed: Her pupils are too small; her eyebrows are too sharp. She has crease on her cheeks and her lips are ugly, like always frowning

-alexon31: Her face just looks so bitter all the time...

26) Flora (Sleeping Beauty)
The first fairy to go. She can grant the gift of beauty but apparently not to herself. Her cheeks aren't in proportion to the rest of her face. She's chubby, which can be adorable, but in this case means the 26th position.

-BraBrief: rat-face, please, go...

-nmdis: Her cheeks I can't ignore them...just because of them she looks ugly.

25) Merryweather (Sleeping Beauty)
Great character but not for her looks; that seems to be the general opinion.

-BelleAnastasia: She's awesome, but not pretty

-LatinoLollipops: She's so cute and funny but defiantly not one of the prettiest

24) Fairy Godmother (Cinderella)
I dislike her mouth, the way she dresses, her round nose. Like the other characters on the film, she's supposed to be less beautiful than Cinderella to make her stand out more. At least, that's my theory. The blue fairy in Pinocchio for instance belongs to a movie without a female protagonist, and she is thought to be one of the most beautiful faces of Disney by some people.

-CodyVenusTrent: She's adorable and cute but not beautiful

-rhythmicmagic: Again, no chin. I definitely think Merryweather deserved to outlast her.

23)Mrs Potts (Beauty and the Beast)
Being a teapot for most of the movie, we don't get to see her much as a human, but when she finally regains her original form she's not that different from the teapot. That's the idea of course, but it means place 23th for her.

-fiina: She looked better as a teapot

-LatinoLollipops: I would rather look like Andrina then Mrs Potts

22) Fauna (Sleeping Beauty)
The prettiest of the fairies in my opinion. I love how the grey hair combines with her green clothes. But still, she's not beautiful really.

-TheCrystalRing: She's...old. She has appeal, but others on this list are prettier

-rhythmicmagic: I really can't see what makes her prettier than any of Ariel's sisters, she needs to leave before any of them does

21)Fa Li (Mulan)
Mulan's mother has very pretty eyes, but her head is more horizontal than vertical and I hate that. She hasn't got much to offer.

-BelleAnastasia: She's not pretty.

Overall points for the movies so far (system explained in comments)
Snow White and the Seven Dwarfs: 1p.
Cinderella: 10p.
Sleeping Beauty: 11, 66p.
The Little Mermaid: 6p.
The Beauty and the Beast: 14p.
Aladdin: 2p.
Pocahontas: -
Mulan: 8, 33p.
The Princess and the Frog: 5p.
Tangled: -