Find these in the Y fiction area:
Real Pigeons series by Andrew McDonald
Last Kids on Earth series by Max Brallier
Galactic Hot Dogs series by Max Brallier
Bad Kitty series by Nick Bruel
Arnie the Doughnut series by Laurie Keller
13 Story Treehouse series by Andy Griffiths
Babymouse: Tales from the Locker by Jennifer Holm
Super Turbo series by Lee Kirby
Max and the MidKnights series by Lincoln Peirce
Captain Underpants series by Dav Pilkey
Mighty Robot series by Dav Pilkey
Link + Hud by Jarrett Pumphrey