Harry: Bottom
Ron: Top
Hermione: Switch
Neville: Bottom
Oliver: Switch
Fred: Top.
George: Top
Draco: Top obviously
Cedric: Switch
Tom: Top
Ginny: Top
Luna: Switch
Bill: Top
Charlie: Top
Blaise: Top
Percy: Bottom
Viktor: Switch
Adrian: Switch
Young Severus: Bottom
Young Sirius: Top
Young James: Top
Young Remus: Switch
Regulus: Top
Frank: Switch