This post is to compile the list of eligible and non-eligible characters from the comments to be previous post.
Note: I have not checked all these against figures on archives, so if you would like to challenge a category, please do so with evidence! :)
Following the discussions on Harry Potter it has been decided that if there are 500 or more stories featuring the woman in a major role, then she is not eligible for this exchange. (This is to try and ensure that the fadom is not overwhelmed by characters from big fandoms who while they might not be hugely writeen about in that fandom are still objectively not rare).
This is in addition to the 20% rule within any fandom.
Eligible Women
Harry Potter
Amelia Bones
Augusta Longbottom
Bathilda Bagshot
Auntie Muriel (Weasley?)
Eileen Prince
Griselda Marchbanks
Millicent Bulstrode
Olympe Maxim
Poppy Pomfrey
Pomona Sprout
Rolanda Hooch
Rita Skeeter
Walburga Black
Wilhelmina Grubbly-Plank
Alias
Anna
Irina
Nadia
Renee
Francie
Rachel
Narnia
Hwin
Susan?
Aravis
Jill Pole
Caspian's wife
Star Trek (2009) Reboot
Joanna McCoy
T'Pring
any of the un-named women seen on the crew of the Enterprise (does this need something more specific or just female crewmembers?)
Winona Kirk?
Star Trek: The Original Series (TOS)
Joanna McCoy
Jocelyn McCoy
Janice Rand
Charlene Masters
Helen Noel
Carol Marcus
T'Pring?
Saavik?
Valeris?
Demora Sulu
J.M. Colt
Zahra Jamal
Yeoman Tamura
Carolyn Palamas
Areel Shaw
Angela Martine
Miranda Jones
Ann Mulhall
Elizabeth Dehner
Tonia Barrows, Mara
Mira Romaine
Doctor Who (new)
Harriet Jones
Nancy (from The Empty Child/The Doctor Dances)
Francine Jones
Tish Jones
Joan Redfern
Sally Sparrow
Astrid Peth
Jenny (from The Doctor's Daughter)
Lady Christina de Souza
Captain Adelaide Brooke
Liz X
Abigail (from A Christmas Carol)
Madame Kovarian
Jenny (from A Good Man Goes to War)
Madame Vastra (from A Good Man Goes to War)
Lorna Bucket (from A Good Man Goes to War)
Jackie Tyler (?rare)
Reinette Poisson (?rare)
Doctor Who (classic)
Dr. Grace Holloway
Susan Foreman
Tegan Jovanka
Nyssa
Liz Shaw
Ace McShane
Barbara Wright
Dodo Chaplet
Polly Wright
Zoe Heriot
Isobel Watkins
Doctor Who and The Curse of Fatal Death
13th Doctor
Emma
Torchwood
Suzie Costello
Kathy Swanson
Lisa Hallett
Estelle Cole
Mary (from Greeks Bearing Gifts)
Mary Cooper
Alice Guppy
Emily Holroyd
Alice Carter
Rhiannon Davies
Lois Habiba
Agent Johnson
Bridget Spears
Esther Drummond
Jilly Kitzinger
Vera Juarez
Charlotte Wills
BBC Sherlock
Any
Axis Powers Hetalia
Taiwan
Vietnam
Belarus
Ukraine
Wy
Liechtenstein
Seychelles
Belgium
Vocaloid (or Japloid)
Gumi
Meiko
SF-A2 Miki
Kaii Yuki
Lily
VY1
Iroha Nekomura
Ring Suzune
Aoki Lapis
CUL
Puella Magi Madoka Magica
Mami Tomoe
Homura Akemi
Madoka Kaname
Sayaka Miki
Kyouko Sakura
Phantom of the Opera - Gaston Leroux
Carlotta
Meg
Mme. Giry
La Sorelli
Jammes
The Phantom of the Opera (book or movie or musical)
Carlotta Guidicelli
Mme. Giry
Meg Giry
The Mentalist
Madeline Hightower
Kristina Frye
Angela Ruskin-Jane
Charlotte Jane
Sophie Miller
Grace Van Pelt
The Office (US)
Kelly
Angela
Meredith
Phyllis
Jan Levenson
Val from Warehouse
Karen Fillipelli
Katy
Babylon 5
Na'Toth
Elizabeth Lochley
Lyta Alexander (?)
Lise Hampton
Timov
Daggair
Mariel
Elizabeth 'Dodger' Durman
Anna Sheridan
Laurel Takashima
LOST
Ana Lucia
Cindy
Bea Klugh
Eloise
Naomi
Ilana
Rose
The Mother
Dresden Files
Karrin Murphy
Molly Carpenter
Charity Carpenter
Ivy aka the Archive
Anastasia Luccio
Lara Raith
Georgia Borden
Susan Rodriguez
Ancient Mai
Martha Liberty
Queen Mab
Leansidhe
Maeve
Maggie Dresden
Buffy the Vampire Slayer
Amy Madison
Anne Pratt
Anne/Chantarelle
Chao-Ahn
First Slayer
Glory
Halfrek
Jenny Calendar
Kendra
Kennedy
Nikki Wood
Rona
Satsu
Vi
Amanda (potential)
Molly (potential)
Annabel (potential)
Any other named potentials (there's a Chloe, isn't there?)
Lydia Chalmers
Pat (Joyce's friend)
Veruca Sunday
Professor Walsh
Sheila (the vampire from School Hard)
Sheila Rosenburg
Marcie Ross (the invisible girl)
Harmony Kendall
Olivia (Giles' English friend. His orgasm friend.)
Angel
Gwen Raiden
Jasmine
Elizabeth (vampire we see with Angel and Darla in the past)
Alonna Gunn
Lorne's mother (played by a man, of course, but arguable)
Bethany Chaulke
Justine
Ilona Costa Bianchi
The Transuding Furies
Jhiera, Princess of Oden Tal
Dana (the damaged Slayer)
Harmony Kendal
The X-Files
Marita
Diana Fowley
Teena Mulder
Samantha Mulder
Cassandra Spender
Melissa Scully
Maggie Scully
Phoebe Green
Scully's girlfriend, Ellen, from "Jersey Devil."
Karen Kosseff (Scully's therapist)
Tara Scully
Arial Luria (from "Kaddish")
Dakota Whitney
Highlander: the series or the movies
Rachel Ellenstein
Heather MacLeod
Brenda Wyatt (MacLeod) (the first movie)
Alex (the third movie)
Randi McFarland
Felice Martins
Rebecca Lord
Grace Chandel
Linda Plager
Annie Devlin
Nefertiri
Rebecca Horne
Midori Koto
Michelle Webster
May-Ling Shen
Ceirdwyn
Kristin
Claudia Jardine
Alexa Bond
Gina Valicourt
Cassandra
Carolyn Marsh
Ingrid
Alex Raven
Kyra
Kate Sutherland
Amy Thomas
Tessa Noel
Angie Burke
Anne Lindsay
Slayers (anime)
Filia ul Copt
Naga the Serpent
Martina Zoana
Mel Navratilova
Sylphiel nel Lahda
Eris
Ozel
Supernatural
Ava Wilson
Lisa Braeden
Madison
Anna Milton
Jessica Moore
Cassie Robinson
Missouri Mosely
Pamela Barnes
Amelia Novak
Claire Novak
Mary Campbell Winchester
Deanna Winchester
Gwen Campbell
Bela Talbot
Sarah Blake
Tessa
Ruby
Ellen Harvelle
Lost Girl
Any
Forever Knight
Probably any
Blade: Trinity (or even the wider Blade Movies Franchise)
Abigail Whistler
Sommerfield
Zoé Sommerfield
Danica Talos
Primeval
Sarah Page
Emily Merchant
Caroline Steel
April Leonard
Christine Johnson
Sanctuary
Abby Corrigan
Erika Myers
Kate Freelander
Ashley Magnus
Clara Griffin
Sally the Mermaid
Dana Whitcomb
Cabal scientist in charge of Ashley's transformation
Kali Bibi
Imogene Worth
Ranna Seneschal
Fallon
Dr Lillian
Lee Afina
Jeanette Anais
Josie (Carentan) Anna -
Mrs Ravi Ganapathiramani (Carentan)
Cassidy Turner (Untouchable)
Charlotte Benoit
Mighty Morphin Power Rangers
Trini Kwan
Aisha Campbell
Delphine
Ms. Appleby
Angela
Rita
Scorpina
Connie
Power Rangers Dino Thunder
Elsa
Hayley
Kylie Styles
Krista Cassidy
Fullmetal Alchemist
Rose Thomas
Paninya (last name?)
Olivier Mira Armstrong
Catherine Armstrong
Rebecca Catalina
Maria Ross
Izumi Curtis
Gracia Hughes
Elicia Hughes
Nina Tucker
Martel
Mrs. Bradley
Lust
Tricia Elric
Pinako Rockbell
Sara Rockbell
Madame Christmas
Ace Attorney
Maya
Franziska
Fringe
Alt!Olivia Dunham
Astrid Farnsworth
Alt! Astrid
Nina Sharp
Rachel Dunham
Ella Blake
Elizabeth Bishop
Marilyn Dunham
Diane Broyles
Amy Jessup
Carla Warren
Rebecca Kibner
Julie Danzig
Women Who are Not eligible
Harry Potter
Hermione
Ginny
Lily
Luna
Tonks
Bellatrix
Minerva
Rose Weasley
Narcissa
Lily Luna
Pansy
Cho
Katie Bell
Molly Weasley
Fleur
Andromeda Tonks
Angelina
Victoire Weasley
Astoria
Petunia
Lavender
Marlene McKinnon
Daphne Greengrass
Hannah Abbott
Lord Of The Rings
Arwen
Eowyn
Galadriel
Fire Emblem: Path of Radiance/Radiant Dawn
Heather
Nephenee
Leanne
Micaiah
Mia
The X-Files
Scully
Reyes
Highlander: the series or the movies
Amanda
Primeval
Abby Maitland
Jess Parker
Helen Cutter
Jenny Lewis
Claudia Brown
Sanctuary
Helen Magnus
Fullmetal Alchemist
Riza
Winry
Supernatuaral
Jo Harvelle
Fringe
Olivia Dunham
Up to date as of 17:30gmt - I haven't recorded all the suggestions for small fandoms as these will be compiled later. :)