This is by no means the definitive list. Aside from a few - Cormac McLaggen, Katie Bell, Cho Chang, Marietta Edgecombe, Eddie Carmichael, Marcus Belby - these characters are not set in stone. A lot of them don't need to have these exact names or be played at all! If you play B. Dunstan as Barry Dunstan, or you have an OC in mind, or you want to move someone, just let me know and I'll see what I can wiggle round.
You may play up to six characters, ideally spread across the houses, but up to two will be allowed in each house as long as they are different genders.
As a guideline, across this sector of the population, this is what we would expect to see. I would, of course, prefer to have too many minorities than too few. I'll cap if the proportions get too out of whack.
26 White British - 17 taken 2 Indian/Pakistani/Bangladeshi - 1 taken by Demelza Robins 2 black - 1 taken by Sally Spinks 1 Chinese/Japanese/Korean - taken by Cho Chang 1 Eastern European or Middle Eastern or Jewish
England - 25 - 14 taken Scotland 2 or 3 - taken by Jamison Dorny, Sienna Capper and Cecil Urquhart Republic of Ireland - 2 - 1 taken by Malcolm Preece Wales - 1 or 2 - 1 taken by Eurig Cadwallader Northern Ireland - 1 - taken by Cormac McLaggen
27 straight - 17 taken 2 gay - 1 taken by Alexander William 2 bi - 2 taken - CAPPED FOR BOYS 1 non-binary/transgender/it's complicated/other
20 living with both birth parents - 13 taken 7 living just with mother - 2 taken - WANTED 2 living with mother and stepfather - 1 taken by Eurig Cadwallader 1 living with father and stepmother 1 living just with father - taken by Jamison Dorny 1 living with relatives (non-parents) - 2 taken by Alexander William and Nick Stebbins - CAPPED 1 adopted or living in foster care
17 Halfbloods - 11 taken 11 Purebloods (5 in Slytherin) - 6 taken (2 in Slytherin) - WANTED IN SLYTHERIN 4 Muggle-borns (none in Slytherin) - 3 taken