Jake.I like that name
A good name for a 13-year-old main character in a diary-like book could be "Avery", "Ella", "Lucas", or "Sophie". These names are gender-neutral and suitable for a young protagonist.
Eragon.
Stanley Yelnats is the character in the book "Holes" whose name is a palindrome.
The main character in the book "Holes," Stanley Yelnats, is fifteen years old.
Metamorphosis written by Franz Kafka
That book is found in the Voyage of the Dawn Treader, the third book in the Chronicles of Narnia. It's a book in the Magician's house.
In the book "Pacific Crossing" by Gary Soto, the character Lincoln is 12 years old.
The main character Wills is 16 years old in the book "Jump the Cracks."
"Scarlet Pimpernel" is the name of a book whose main character is Sir Percy
The book you are referring to is "Teaspoon and an Open Mind" by Wally Amos. The main character, Teaspoon, is a music producer who starts his own record company in the story.
Sassy, a character in the book "Scorpions" by Walter Dean Myers, is 12 years old. She is the younger sister of the main character, Jamal, who is 12 years old as well.
9 or 10 years
Cipher is a character in the X-Men comic books. She is a mutant whose given name is Alisa Tager. Her mutant abilities include stealth, phasing, and invisibility.