all

• percy weasley vs. his entire family arc

goblet of fire

• the full barty crouch / barty crouch jr. / winky backstory

order of the phoenix

• more character development and backgrounds for side characters: sirius, tonks, molly and arthur weasley
• harry shouting at dumbledore after the battle of the department of mysteries; detailed explanation of the prophecy

half-blood prince

• voldemort's past