Disclaimer: Harry Potter is JK Rowling's property, I just own my headcanons and OCs
If my headcanons and original ideas interest you go on polyvore look up member ericatharp93 I have a collection called Harry Potter's Classmates that have more detail.
I also plan to turn this into a series of one shots where each chapter focues on a character all 7years & 19 years later it's a work in progress right now so be patient :)
The Original Forty
1) Abbott, Hannah
2) Bones, Susan
3) Boot, Trevor Terry
4) Brocklehurst, Mandy
5) Brown, Lavender
6) Bulstrode, Millicent
7) Corner, Michael
8) Cornfoot, Stephen
9) Crabbe, Vincent
10) Davis, Tracey
11) Entwhistle, Kevin
12) Finch-Fletchley, Justin
13) Finnigan, Seamus
14) Goldstein, Anthony
15) Goyle, Gregory
16) Granger, Hermione
17) Greengrass, Queenie Daphne
18) Hopkins, Wayne
19) Jones, Megan
20) Li, Sue
21) Longbottom, Neville
22) MacDougal, Isobel Morag
23) Macmillan, Ernest
24) Malfoy, Draco
25) Malone, Roger Serphina
26) Midgen, Eloise [Quirrel], crossed out, subsequently used for teacher]
27) Moon, Lily Lilith
28) Nott, Theodore
29) Parkinson, Pansy
30) Patil, Madhari Padma
31) Patil, Mati Pavarti
32) Perks, Sally-Anne
33) Potter, Harry
34) Rivers, Oliver Octivius
35) Roper, Sophie
36) Smith, Sally Zacharias
37) Thomas, Gary Dean
38) Turpin, Lisa
39) Weasley, Ronald
40) Zabini, Blaise
*I added 3 Movie Canon characters, 2 Book/Movie Canon Inspired characters, & 5 Original Characters (making Harry's class 50 instead of 40)*
My Headcanon Class of 1991-1998
1) Abbott, Hannah [Half-Blood, Hufflepuff] {Played by Charlotte Skeeoch/Ayla Kell}
2) Bones, Susan [Pureblood, Hufflepuff] {Played by Eleanor Columbus/Danielle Panabaker}
3) Boot, Terry [Half-Blood, Ravenclaw] {Played by James Wolk}
4) Brocklehurst, Mandy [Half-Blood, Ravenclaw] {Played by Emily Kinney}
5) Brown, Lavender + [Half-Blood, Gryffindor] {Played by Jessie Cave/Mercedes McNab}
6) Bulstrode, Millicent [Half-Blood, Slytherin] {Played by Mae Whitman}
7) Corner, Michael [Half-Blood, Ravenclaw] {Played by Darren Criss}
8) Cornfoot, Stephen [Pureblood, Hufflepuff] {Played by Milo Ventigimlia}
9) Crabbe, Vincent + [Pureblood, Slytherin] {Played by Jamie Waylett}
10) Davis, Tracey [Half-Blood, Slytherin] {Played by Leighton Meester}
11) Dunbar, Fay + [Half-Blood, Gryffindor] {Played by Willa Holland} *Movie Canon Inspired*
12) Entwhistle, Kevin [Muggleborn, Ravenclaw] {Played by Skylar Astin}
13) Fawley-Rosier, Yulia + [Pureblood, Ravenclaw] {Played by Abigail Breslin} *Original Character*
14) Finch-Fletchley, Justin [Muggleborn, Hufflepuff] {Played by Edward Randall/Kevin Zegars}
15) Finnigan, Seamus [Half-Blood, Gryffindor] {Played by Devon Murray}
16) Goldstein, Anthony [Pureblood, Ravenclaw] {Played by Dean Geyer}
17) Goyle, Gregory [Pureblood, Slytherin] {Played by Joshua Herdman}
18) Granger, Hermione [Muggleborn, Gryffindor] {Played by Emma Watson}
19) Greengrass, Daphne [Pureblood, Slytherin] {Played by Katie McGrath}
20) Hopkins, Wayne [Half-Blood, Hufflepuff] {Played by Kyle Gallner}
21) Irving, Isaac + [Muggleborn, Hufflepuff] {Played by Nicolas Hoult} *Original Character*
22) Jones, Megan [Half-Blood, Hufflepuff] {Played by Alexis Bledel}
23) Kippling, Daniel + [Muggleborn, Hufflepuff] {Played by Zane Holtz} *Original Character*
24) Li, Su [Half-Blood, Ravenclaw] {Played by Jenna Ushkowitz}
25) Longbottom, Neville [Pureblood, Gryffindor] {Played by Matthew Lewis}
26) Lyseth, Connor + [Muggleborn, Ravenclaw] {Played by Drake Bell} *Original Character*
27) MacDougal, Morag [Pureblood, Ravenclaw]{Rachelle Lefevre}
28) Macmillan, Ernest [Pureblood, Hufflepuff] {Played by Louis Doyle/Bobby Lockwood}
29) Malfoy, Draco [Pureblood, Slytherin] {Played by Tom Felton}
30) Malone, Serphina [Half-Blood, Hufflepuff] {Played by Lea Michele}
31) Midgen, Eloise [Muggleborn, Hufflepuff] {Played by Tina Majorino}
32) Montgomery, Patricia [Half-Blood, Hufflepuff] {Played by Anna Kendrick} *Canon Inspired*
33) Montgomery, Patrick [Half-Blood, Ravenclaw] {Played by Colin O'Donoghue} *Canon Inspired*
34) Moon, Lillith [Half-Blood, Ravenclaw] {Played by Phoebe Tonkin}
35) Nott, Theodore [Pureblood, Slytherin] {Played by Ed Westwick}
36) Parkinson, Pansy [Pureblood, Slytherin] {Played by Scarlett Byrne}
37) Patil, Padma [Pureblood, Ravenclaw]{Played by Ileana D'Cruz/Afshan Azad/Shefali Chowdhury}
38) Patil, Parvatil [Pureblood, Gryffindor] {Played by Ileana D'Cruz/Shefali Chowdhury/Afshan Azad}
39) Perks, Sally-Anne + [Muggleborn, Hufflepuff] {Played by Ellen Page}
40) Potter, Harry [Half-Blood, Gryffindor] {Played by Daniel Radcliffe}
41) Rivers, Octivius [Muggleborn, Ravenclaw] {Played by Jonathan Groff}
42) Roper, Sophie [Half-Blood, Slytherin] {Played by Eliza Dushku}
43) Runcorn, Ruby + [Half-Blood, Gryffindor] {Played by Katherine McNamara} *Original Character*
44) Shacklebolt, Bem [Half-Blood, Gryffindor] {Played by Charles Michael Davis} *Movie Canon Inspired*
45) Shacklebolt, Kellah [Half-Blood, Gryffindor] {Played by Brandy Norwood} *Movie Canon Inspired*
46) Smith, Zacharias + [Pureblood, Hufflepuff] {Played by Nick Shirm/Brett Davern}
47) Thomas, Dean [Muggleborn/Half-Blood, Gryffindor] {Played by Alford Encoch}
48) Turpin, Lisa + [Muggleborn, Ravenclaw]{Played by Merritt Patterson}
49) Weasley, Ronald [Pureblood, Gryffindor] {Played by Rupert Grint}
50) Zabini, Blaise [Pureblood, Slytherin] {Played by Louis Cordice}
+ Means Character Died In the War
Hopefully this intrigued you, stick around for the real chapters :)