I personally think that all the deaths were meaningful deaths and feel like they took place at the right moment, even so I kept wondering what this or that character would had done if he/she had stayed (at least a little longer)
http://www.ranker.com/list/which-h-potter-character-should-have-lived-_longer_-/humbertoibarra, film, film characters, fictional characters, characters,
Barty Crouch Jr.
Barty Crouch Sr.
Cedric Diggory
Nymphadora Tonks
Peter Pettigrew
Quirinus Quirrell
Remus Lupin
Sirius Black
Emmeline Vance
Amelia Bones