Diary of a Wimpy Kid series - by Jeff Kinney
Big Nate (chapter book series and graphic novel series) - by Lincoln Peirce
Percy Jackson and the Olympians series and Heroes of Olympus series - by Rick Riordan
Harry Potter series - by J. K. Rowling
The Babysitters Club series (chapter books/graphic novels) - by Ann Martin/RainaTelgemeier
A Series of Unfortunate Events - by Lemony Snicket
I Survived series - by LaurenTarshis
Fudge series - by Judy Blume
Wings of Fire (chapter book series and graphic novel series) - by Tui Sutherland
39 Clues series - by various authors
Series of Unfortunate Events series - by Lemony Snicket
Goosebumps series - by R. L. Stine
Warriors series by Erin Hunter
Dork Diaries series - by Rachel Renee Russell
Who Was series - by various authors
Notebook of Doom series - by Troy Cummings
Amulet series (graphic novel) - by Kazu Kibuishi
Raina Telgemeier books (examples: Sister, Smile, and Drama)
Bone series (graphic novel) - by Jeff Smith
Who Would Win series - by Jerry Pallotta