Confessions of a Former Bully by Trudy Ludwig, illustrated by Beth Adams

From chapters.ca:
After Katie gets caught teasing a schoolmate, she's told to meet with Mrs. Petrowski, the school counselor, so she can make right her wrong and learn to be a better friend. Bothered at first, it doesn't take long before Katie realizes that bullying has hurt not only the people around her, but her, too. Told from the unusual point of view of the bullier rather than the bullied, Confessions of a Former Bully provides kids with real life tools they can use to identify and stop relational aggression.

The Bramble by Lee Nordling and Bruce Zick

From chapters.ca:
In this beautifully illustrated and mostly wordless book, Cameron isn't small, but he's not exactly big. He's not slow, but he's also not quick. He wants friends, but it never quite seems to work out. And in a game of tag, he's going to end up "it." Or at least that's how things are on this side of the Bramble. On the other side, it's a different story. On the other side of the Bramble, something extraordinary can happen, something that changes everything.

Sam and the Big Kids by Emily Arnold McCully

From chapters.ca:
Poor Sam! He wants to play with the big kids. "You are too small," they tell him. "Go home." They hide from Sam, then they won't let him play in their fort. But when the big kids need help, who saves the day? Sam, of course!

Fancy Nancy and the Mean Girl by Jane O’Connor, illustrated by Robin Preiss Glasser

From chapters.ca:
Nancy will have to do some fancy footwork to resolve her predicament in this latest Fancy Nancy story for beginning readers. Much to her dismay, Nancy has been chosen for the relay team in this year's Field Day at school. Despite her many natural talents, Nancy isn't much of a runner. She's afraid of letting her team down especially after finding out that an unkind (that's another word for mean) girl in her class is on the team too. With a little help from her dad, Nancy tries her best, stands up for herself, and makes a new friend.

Yoko’s Show-and-Tell by Rosemary Wells

From chapters.ca: 

When Yoko's grandparents send her a beautfui antique doll all the way from Japan, Yoko couldn't be happier. She places Miki on a windowsill and brings her candy every day. On Girls' Festival Day, Yoko wants to show Miki to her class and tell them all about the Japanese holiday. In her Big No voice Mama says, "We don't trouble trouble or trouble will trouble us." But Yoko is so excited about Girls' Day that she can't resist taking Miki to school. Mama will never know.... What could possibly go wrong? Rosemary Wells brings the loveable Yoko back in a story that deftly explores cultural differences, bullying at school, and learning to forgive, with her trademark accessibility and elegance.

Stanza by Jill Esbaum, illustrated by Jack E Davis

From chapters.ca:
There's a slobbery thug in town, and his name is Stanza. He bullies everybody. He eats chicken pot pie. And... he writes poetry. On the sly. At night. Because he's extremely afraid his bully brothers will find out. But Stanza doesn't let that stop him from entering one of his poems into a jingle contest. Does he win? Well, what if he did... not?

Not So Tall for Six by Dianna Hutts Aston, illustrated by Frank W. Dormer

She may not be very tall for six, but she has a lot of courage.

NERDS: National Espionage, Rescue, and Defense Society by Michael Buckley, illustrated by Ethen Beavers

From chapters.ca:
NERDS combines all the excitement of international espionage with all the awkwardness of elementary school, and the results are hilarious. A group of unpopular fifth graders run a spy network from inside their school. With the help of cutting- edge science, they transform their nerdy qualities into incredible abilities! Their enemies? An array of James Bond- style villains, each with an evil plan more diabolical and more ridiculous than the last. Publishers Weekly raved: "Buckley has a flair for exaggerated humor." School Library Journal said: "Funny, clever, and thoroughly entertaining."

Monster Mama by Liz Rosenberg, illustrated by Stephen Gammel

Patrick Edward loves his mother even though she's a monster. After all, sometimes it's handy having a monster for a mother.

Bird Child by Nan Forler, illustrated by Francois Thisdale

From chapters.ca:
Bullying and the ability to rise above it are at the heart of this strikingly beautiful picture book. All school- aged children have either bullied, been bullied, or witnessed bullying, and all too often, they feel powerless to stop what has been set in motion. Such is not the case with Eliza. Her mother has given her "wings to fly" and the ability to see all the possibilities that lie before her. So, when bullies pick on the new student, Lainey, gradually robbing her of her smile and ability to paint beautiful pictures, Eliza wants to help, and she does, by finding a way to show Lainey all that she can be.

Willow's Whispers by Lana Button, illustrated by Tania Howells

From chapters.ca:
When Willow speaks, her words slip out as soft and shy as a secret. At school, her barely audible whisper causes her no end of troubles. But Willow is as resourceful as she is quiet, and she fashions a magic microphone from items she finds in the recycling bin. But Willow's clever invention is only a temporary solution. How will this quiet little girl make herself heard?

Freckleface Strawberry and the Dodgeball Bully by Julianne Moore, illustrated by LeUyen Pham

From chapters.ca:
Freckleface Strawberry loves the Early Bird program at school because it means extra time on the playground- except when it rains. Rain means indoor playtime... and facing the school bully Windy Pants Patrick in a bruising game of dodgeball. Ignoring him seems the safest thing, but what's our freckled heroine to do when she's forced to confront the bully alone? Beat him at his own game, of course. A funny, inspiring story about an all- too- common problem that kids, parents, and teachers will easily relate to.

Yoon and the Jade Bracelet by Helen Recorvits, illustrated by Gabi Swiatkowska

From chapters.ca:
It is Yoon's birthday and all she wants is a jump rope so she can play with the other girls in the school yard. Instead, Yoon's mother gives her a Korean storybook about a silly girl who is tricked by a tiger. Yoon also receives a jade bracelet that once belonged to her grandmother. The next day at school, a girl offers to teach Yoon how to jump rope, but for a price: she wants to borrow the jade bracelet. When Yoon tries to get her bracelet back, the girl swears it belongs to her. Yoon must use the lessons learned in her storybook and her "Shining Wisdom" to retrieve the precious keepsake.

The Chocolate War by Robert Cormier

From chapters.ca:
Stunned by his mother's recent death and appalled by the way his father sleepwalks through life, Jerry Renault, a New England high school student, ponders the poster in his locker - Do I dare disturb the universe? Part of his universe is Archie Costello, leader of a secret school society - the Virgils - and master of intimidation. Archie himself is intimidated by a cool, ambitious teacher into having the Virgils spearhead the annual fund-raising event - a chocolate sale. When Jerry refuses to be bullied into selling chocolates, he becomes a hero, but his defiance is a threat to Archie, the Virgils, and the school. In the inevitable showdown, Archie's skill at intimidation turns Jerry from hero to outcast, to victim, leaving him alone and terribly vulnerable.