These are in no particular order. The headings are more so readers can have a place to reference. As the summary said, these are 6 word sentences by several characters. If you are curious about a line or want to argue it, I will do my best to respond. Well enjoy.
Aftermath
"Weasley's Wizard Wheezes; Looking for Partner"
"Weasley Sunday Dinners, Minus one chair"
"Funeral Robes Sold By the Dozens"- Headliner by Rita Skeeter
"War ended. Scars are magic immune."- Seamus Finnegan after visit to Madame Pomfrey
"There are wounds I cannot heal"- Madam Pomfrey upon examination of the Longbottoms and Weasleys
"It was blood. Now it's water." Luna Lovegood on the dead
"Scared to die. No one waiting"- Tom Riddle from birth and in death
"No more losses. I create life." Neville Longbottom on turning down Auror position
Family
"I remember. We have a son."- Alice Longbottom to Frank Longbottom
"Thanks for Harry; Watching over Fred"- Lily Evans Potter to Molly Weasley (A/N from tumblr post)
"Saw your owl; She misses you"- Lily Potter
"I'm sorry. I wasn't the hero."- James Potter
"We will always be a family"- Sirius Black (slightly altered from book)
"For power I traded my son."-Lucius Malfoy in private to Severus Snape
"More than power, I wanted family"- Narcissa Malfoy on the family she couldn't have
"I used to have a sister"- Petunia Dursley after departure of Lily
"I used to be a sister"- Petunia Dursley after departure of Harry
"Beat 3 Death Eaters; Where's Fred?"- George Weasely, Battle of Hogwarts
"The Mirror is broken I suppose"- George Weasely, Mirror of Erinyes (A/N search the explanation)
"Her happiest day. My worst one."-Severus Snape on an invitation
"I buried them. Together seemed fitting."- Severus Snape
"The truth is I'm a coward"- Severus Snape after the death of Lily
"The bravest man I've ever known"- Harry Potter (end of Book 7)
Other Thoughts
"For the future of our children"- Dumbledore's Army
"I'm sorry. Owlery is closed today."- Owlery attendant
"Every knight needs a faithful squire." Ronald Weasely teasingly to Harry Potter (Book 1)
"He was squire to your knight."- Ronald Weasley to Harry Potter on death of Dobby (Book 7)
"Thank you for bringing me home"- Cedric Diggory
"They'll hate you boy." "I know."- a conversation overheard, participants unknown
"I wish I was a Muggle"- someone somewhere
"In another life, we'll be together."-unknown