Here is a list of all the canon characters that are in the Golden Era. I included as many as I could but if you think I'm missing any, feel free to remind me and I'll add them.
Adults
Order of the PhoenixArthur Weasley - Unclaimed
Molly Weasley - Unclaimed
Remus Lupin - Unclaimed
Mad-Eye Moody - Unclaimed
Nymphadora Tonks - Unclaimed
Sirius Black - Unclaimed
Dedalus Diggle - Unclaimed
Elphias Doge - Unclaimed
Mundungus Fletcher - Unclaimed
Hestia Jones - Unclaimed
Sturgis Podmore - Unclaimed
Kingsley Shacklebolt - Unclaimed
Emmeline Vance - Unclaimed
William 'Bill' Weasley - Unclaimed
Charlie Weasley - Unclaimed
Death EatersLord Voldemort aka Tom Riddle - Unclaimed
Peter Pettigrew - Unclaimed
Narcissa Malfoy - Unclaimed
Lucius Malfoy - Unclaimed
Bellatrix Lestrange - Unclaimed
Alecto Carrow - Unclaimed
Amycus Carrow - Unclaimed
Augustus Rookwood - Unclaimed
Antonin Dolohov - Unclaimed
Fenrir Greyback - Unclaimed
Walden Macnair - Unclaimed
____ Avery Jr. - Unclaimed
Evan Rosier - Unclaimed
____ Nott Snr. - Unclaimed
Rabastan Lestrange - Unclaimed
Rodolphus Lestrange - Unclaimed
____ Selwyn - Unclaimed
Thorfinn Rowle - Unclaimed
____ Travers - Unclaimed
Corban Yaxley - Unclaimed
Other AdultsPercival Weasley - Unclaimed
Oliver Wood - Unclaimed
Penelope Clearwater - Unclaimed
Amelia Bones - Unclaimed
Amos Diggory - Unclaimed
Andromeda Tonks - Unclaimed
Ted Tonks - Unclaimed
Fleur Delacour - Unclaimed
Viktor Krum - Unclaimed
Augusta Longbottom - Unclaimed
Ludo Bagman - Unclaimed
Barty Crouch Snr. - Unclaimed
Xenophilous Lovegood - Unclaimed
Cornelius Fudge - Unclaimed
Professors
Headmaster, Albus Dumbledore - Unclaimed
Deputy Headmistress and Transfiguration Professor, Minerva McGonagall - Unclaimed
Potions Professor, Severus Snape - Unclaimed
Charms Professor, Filius Flitwick - Unclaimed
History of Magic Professor, Cuthbert Binns - Unclaimed
Care of Magical Creatures Professor, Hagrid - Unclaimed
Herbology Professor, Pomona Sprout - Unclaimed
High Inquisitor and Defence Against the Dark Arts Professor, Dolores Umbridge - Unclaimed
Arithmancy Professor, Septima Vector - Unclaimed
Astronomy Professor, Aurora Sinistra - Unclaimed
Divination Professor, Sybill Trelawney/Firenze - Unclaimed
Flying Professor and Quidditch Ref, Rolanda Hooch - Unclaimed
Muggle Studies Professor, Charity Burbage - Unclaimed
Ancient Runes Professor, Bathsheda Babbling - Unclaimed
Medi-Witch, Poppy Pomfrey - Unclaimed
Students
Gryffindor7th Year, Angelina Johnson - Unclaimed
7th Year, Lee Jordan - Unclaimed
7th Year, Alicia Spinnet - Unclaimed
7th Year, Fred Weasley - Unclaimed
7th Year, George Weasley - Unclaimed
6th Year, Katie Bell - Unclaimed
6th Year, Cormac McLaggen - Unclaimed
5th Year, Lavender Brown - Unclaimed
5th Year, Seamus Finnigan - Unclaimed
5th Year, Hermione Granger - Unclaimed
5th Year, Neville Longbottom - Unclaimed
5th Year, Parvati Patil - Unclaimed
5th Year, Harry Potter - Unclaimed
5th Year, Dean Thomas - Unclaimed
5th Year, Ronald 'Ron' Weasley - Unclaimed
4th Year, Colin Creevey - Unclaimed
4th Year, Ginny Weasley - Unclaimed
3rd Year, Romilda Vane - Unclaimed
2nd Year, Dennis Creevey - Unclaimed
2nd Year, Natalie MacDonald - Unclaimed
2nd Year, Jimmy Peakes - Unclaimed
1st Year, Euan Abercrombie - Unclaimed
Hufflepuff5th Year, Hannah Abbott - Unclaimed
5th Year, Susan Bones - Unclaimed
5th Year, Justin Flinch-Fletchley - Unclaimed
5th Year, Wayne Hopkins - Unclaimed
5th Year, Megan Jones - Unclaimed
5th Year, Ernie MacMillan - Unclaimed
2nd Year, Eleanor Branstone - Unclaimed
2nd Year, Owen Cauldwell - Unclaimed
2nd Year, Laura Madley - Unclaimed
2nd Year, Kevin Whitby - Unclaimed
1st Year, Zeller Rose - Unclaimed
Unknown Year, Zacharias Smith - Unclaimed
Unknown Year, _____ Stebbins - Unclaimed (Male, Year up to you as well as first name)
Unknown Year, _____ Summers - Unclaimed (Male, Year up to you as well as first name)
Unknown Year, _____ Summerby - Unclaimed (Male, Year up to you as well as first name)
Ravenclaw7th Year, Roger Davies - Unclaimed
6th Year, Eddie Carmichael - Unclaimed
6th Year, Cho Chang - Unclaimed
6th Year, Marietta Edgecombe - Unclaimed
5th Year, Terry Boot - Unclaimed
5th Year, Mandy Brocklehurst - Unclaimed
5th Year, Micheal Corner - Unclaimed
5th Year, Anthony Goldstein - Unclaimed
5th Year, Su Li - Unclaimed
5th Year, Morag McDougal - Unclaimed
5th Year, Padma Patil - Unclaimed
5th Year, Lisa Turnip - Unclaimed
4th Year, Luna Lovegood - Unclaimed
3rd Year, Stewart Ackerley - Unclaimed
3rd Year, Orla Quirke - Unclaimed
Slytherin7th Year, ____ Montague - Unclaimed (First name unknown, up to you)
7th Year, Adrian Pucey - Unclaimed
7th Year, _____ Warrington - Unclaimed
5th Year, Millicent Bulstrode - Unclaimed
5th Year, Vincent Crabbe - Unclaimed
5th Year, Tracey Davis - Unclaimed
5th Year, Gregory Goyle - Unclaimed
5th Year, Daphne Greengrass - Unclaimed
5th Year, Draco Malfoy - Unclaimed
5th Year, Theodore Nott - Unclaimed
5th Year, Pansy Parkinson - Unclaimed
5th Year, Blaise Zabini - Unclaimed
4th Year, _____ Harper - Unclaimed (First name unknown, it's a boy)
3rd Year, Astoria Greengrass - Unclaimed
2nd Year, Malcolm Baddock - Unclaimed
2nd Year, Graham Pritchard - Unclaimed