Obviously, this page has spoilers for Deathly Hallows. You've been warned. Not all quotes are said by Tonks, a few on here just have a mention of her.

"Harry, guess what?" said Tonks from her perch on top of the washing machine, and she wiggled her left hand at him; a ring glittered there. "You got married?" Harry yelped, looking from her to Lupin. "I'm sorry you couldn't be there, Harry, it was very quiet."

-- Chapter 4: The Seven Potters

"Which leaves you and me, Ron!" said Tonks brightly, knocking over a mug tree as she waved at him.

-- Chapter 4: The Seven Potters

Tonks landed in a long skid that sent earth and pebbles everywhere. "Remus!" Tonks cried as she staggered off the broom into Lupin's arms. His face was set and white: He seemed unable to speak. Ron tripped dazedly toward Harry and Hermione.

-- Chapter 4: The Seven Potters

"Ron was great," said Tonks warmly, relinquishing her hold on Lupin. "Wonderful. Stunned one of the Death Eaters, straight to the head, and when you're aiming at a moving target from a flying broom-"

-- Chapter 5: The Fallen Warrior

"Bellatrix," said Tonks. "She wants me quite as much as she wants Harry, Reuse, she tried very hard to kill me. I just wish I'd got her, I owe Bellatrix. But we definitely injured Rodolphus. . . . Then we got to Ron's Auntie Muriel's and we'd missed our Portkey and she was fussing over us-"
A muscle was jumping in Lupin's jaw. He nodded, but seemed unable to say anything else.
"So what happened to you lot?" Tonks asked, turning to Harry, Hermione, and Kingsley.

-- Chapter 5: The Fallen Warrior

"Thank you," said Mrs. Weasley, "for our sons."
"Don't be silly, Molly," said Tonks at once.

-- Chapter 5: The Fallen Warrior

"Mad-Eye," said Mr. Weasley. "Dead."
The twins' grins turned to grimaces of shock. Nobody seemed to know what to do. Tonks was crying silently into a handkerchief; She had been close to Mad-Eye, Harry knew, his favorite and his prot´eg´e at the Ministry of Magic. Hagrid, who had sat down on the floor in the corner where he had most space, was dabbing at his eyes with his tablecloth-sized handkerchief.

-- Chapter 5: The Fallen Warrior

"You-Know-Who acted exactly as Mad-Eye expected him to," sniffed Tonks, "Mad-Eye said he's expect the real Harry to be with the toughest, most skilled Aurors. He chased Mad-Eye first, and when Mundungus gave them away he switched to Kingsley. . . . "

-- Chapter 5: The Fallen Warrior

"Where are you going?" said Tonks and Fleur together.
"Mad-Eye's body," said Lupin. "We need to recover it."

-- Chapter 5: The Fallen Warrior

Although Lupin smiled as he shook Harry's hand, Harry thought he looked rather unhappy. It was all very odd; Tonks, beside him, looked simply radiant.

-- Chapter 7: The Will of Albus Dumbledore

"Wotcher," said a familiar voice as he came out of the marquee again and found Tonks and Lupin at the front of the queue. She had turned blonde for the occasion. "Arthur told us you were the one with the curly hair. Sorry about last night," she added in a whisper as Harry led them up the aisle. "The Ministry's being very anti-werewolf at the moment and we thought our presence might not do you any favors."

-- Chapter 8: The Wedding

Hermione turned pink. There was another pause, an awkward and embarrassed one, and then Lupin said, with an air of forcing himself to admit something unpleasant. "Tonks is going to have a baby."

-- Chapter 11: The Bribe

"Oh, didn't I tell you?" said Ron in surprise. "Bill told me Lupin's living with Tonks again! And apparently she's getting pretty big too. . . "

-- Chapter 22: The Deathly Hallows

He straightened up, looked around the room, making sure of who was there, then cried aloud, "It's a boy! We've named him Ted, after Dora's father!"
Hermione shrieked.
"Wha-? Tonks-Tonks has had the baby?"
"Yes, yes, she's had the baby!" shouted Lupin. All around the table came cries of delight, sighs of relief: Hermione and Fleur both squealed, "Congratulations!" and Ron said, "Blimey, a baby!" as if he had never heard of such a thing before.
"Yes-yes-a boy," said Lupin again, who seemed dazed by his own happiness. He strode around the table and hugged Harry; the scene in the basement of Grimmauld Place might never have happened.
"You'll be godfather?" he said as he released Harry. "M-me?" stammered Harry.
"You, yes, of course-Dora quite agrees, no one better-"
"I-yeah-blimey-"
Harry felt overwhelmed, astonished, delighted; now Bill was hurrying to fetch wine, and Fleur was persuading Lupin to join them for a drink. "I can't stay long, I must get back," said Lupin, beaming around at them all: He looked years younger than Harry had ever seen him. "Thank you, thank you, Bill"

-- Chapter 25: Shell Cottage

"To Teddy Remus Lupin," said Lupin, "a great wizard in the making!"
"'Oo does 'e look like?" Fleur inquired.
"I think he looks like Dora, but she thinks he is like me. Not much hair. It looked black when he was born, but I swear it's turned ginger in the hour since. Probably blond by the time I get back. Andromeda says Tonks's hair started changing color the day that she was born." He drained his goblet. "Oh, go on then, just one more," he added, beaming, as Bill made to fill it again.

-- Chapter 25: Shell Cottage

"I-oh yes-he's fine!" Lupin said loudly. "Yes, Tonks is with him-at her mother's-"
Percy and the other Weasleys were still staring at one another, frozen. "Here, I've got a picture!" Lupin shouted, pulling a photograph from inside his jacket and showing it to Fleur and Harry, who saw a tiny baby with a tuft of bright turquoise hair, waving fat fists at the camera.

-- Chapter 30: The Sacking of Severus Snape

"Is everyone okay?" said Ginny and Tonks together.
"'S far as we know," said Harry. "Are there still people in the passage to the Hog's Head?"
...

Harry looked at Tonks.
"I thought you were supposed to be with Teddy at your mother's?"
"I couldn't stand not knowing-" Tonks looked anguished. "She'll look after him-have you seen Remus?"
"He was planning to lead a group of fighters into the grounds-"
Without another word, Tonks sped off.

-- Chapter 31: The Battle of Hogwarts

"As long as it's not any of our lot!" said a voice: Harry turned and saw Ginny and Tonks, both with their wands drawn at the next window, which was missing several panes. Even as he watched, Ginny sent a well-aimed jinx into a crowd of fighters below.

-- Chapter 31: The Battle of Hogwarts

"He was dueling Dolohov," shouted Aberforth, "haven't seen him since!"
"Tonks," said Ginny, "Tonks, I'm sure he's okay-"
But Tonks had run off into the dust after Aberforth.

-- Chapter 31: The Battle of Hogwarts

Without a word to Harry, Ron and Hermione walked away. Harry saw Hermione approach Ginny, whose face was swollen and blotchy, and hug her. Ron joined Bill, Fleur, and Percy, who flung an arm around Ron's shoulders. As Ginny and Hermione moved closer to the rest of the family, Harry had a clear view of the bodies lying next to Fred. Remus and Tonks, pale and still and peaceful-looking, apparently asleep beneath the dark, enchanted ceiling.

The Great Hall seemed to fly away, become smaller, shrink, as Harry reeled backward from the doorway. He could not draw breath. He could not bear to look at any of the other bodies, to see who else had died for him. He could not bear to join the Weasleys, could not look into their eyes, when if he had given himself up in the first place, Fred might never have died. . .

He turned away and ran up the marble staircase. Lupin, Tonks. . .He yearned not to feel. . .He wished he could rip out his heart, his innards, everything that was screaming inside him. . .

-- Chapter 33: The Prince's Tale

The images of Fred, Lupin, and Tonks lying dead in the Great Hall forced their way back into his mind's eye, and for a moment he could hardly breathe: Death was impatient. . . .

-- Chapter 34: The Forest Again

They moved Voldemort's body and laid it in a chamber off the Hall, away from the bodies of Fred, Tonks, Lupin, Colin Creevey, and fifty others who had died fighting him.

-- Chapter 36: The Flaw in the Plan

Happiness would come, Harry thought, but at the moment it was muffled by exhaustion, and the pain of losing Fred and Lupin and Tonks pierced him like a physical wound every few steps. Most of all he felt the most stupendous relief, and a longing to sleep.

-- Chapter 36: The Flaw in the Plan

"Our Teddy! Teddy Lupin! Snogging our Victoire! Our cousin! And I asked Teddy what he was doing-"
"You interrupted them?" said Ginny. "You are so like Ron-"
"-and he said he'd come to see her off! And then he told me to go away! He's snogging her!" James added as though worried he had not made himself clear.
"Oh, it would be lovely if they got married," whispered Lily sarcastically. "Teddy would really be part of the family then!"
"He already comes round for dinner about four times a week," said Harry.
"Why don't we just invite him to live with us and have done with it?"
"Yeah!" said James enthusiastically. "I don't mind sharing a room with Al-Teddy could have my room!"

-- Epilogue