Long-running epics

The Fragrant Flower Blooms with Dignity

Saka Mikami · 123 books · 2021–2026

One Piece

Eiichiro Oda · 114 books · 1997–2025

Ranma ½

Rumiko Takahashi · 82 books · 1987–2017

Star Trek

James Blish · 81 books · 1967–1977

Nancy Drew Mystery Stories

Carolyn Keene · 78 books · 1930–2003

In Death

Nora Roberts · 72 books · 1995–2025

Dr. Priestley detective novels

Cecil Street · 71 books · 1927–1961

Goosebumps

R. L. Stine · 62 books · 1992–1997

canon of Sherlock Holmes

Arthur Conan Doyle · 62 books · 1887–1990

Desmond Merrion detective stories

Cecil Street · 61 books · 1930–1960

Discworld

Terry Pratchett · 55 books · 1986–2015

Animorphs

Katherine Applegate · 54 books · 1996–2001

The Saint

Leslie Charteris · 54 books · 1928–1997

Oz book series

L. Frank Baum · 53 books · 1900–2006

Fighting Fantasy

Steve Jackson · 51 books · 1982–1995

James Bond

Ian Fleming · 51 books · 1953–2018

Sune

Anders Jacobsson · 49 books · 1984–2023

Xanth

Piers Anthony · 47 books · 1977–2022

Yona of the Dawn

Mizuho Kusanagi · 47 books · 2010–2026

Fullmetal Alchemist

Hiromu Arakawa · 45 books · 2002–2012

Haikyu!!

Haruichi Furudate · 45 books · 2012–2020

87th Precinct

Evan Hunter · 43 books · 1956–2005

Berserk

Kōji Mori · 43 books · 1990–2025

Darkover series

Mercedes Lackey · 43 books · 1961–2016

Platonic dialogue

Plato · 43 books · 41 BCE–1963

Pepper&Carrot

David Revoy · 41 books · 2014–2024

Star Trek: Voyager

Michael Jan Friedman · 41 books · 1995–2000

Gor

John Norman · 38 books · 1966–2024

Hunter × Hunter

Yoshihiro Togashi · 38 books · 1998–2024

The Three Investigators

Michael Collins · 37 books · 1964–1979

The Year's Best Science Fiction

Gardner Dozois · 37 books · 1984–2018

Bert Diaries

Anders Jacobsson · 36 books · 1987–2020

Classici dell'arte

various authors · 36 books · 1966–1978

Künstler-Monographien

various authors · 36 books · 1895–1923

The Dresden Files

Jim Butcher · 36 books · 2000–2020

Warriors

Victoria Holmes · 35 books · 2003–2013

canon of Hercule Poirot

Agatha Christie · 33 books · 1920–1975

Alex Cross

James Patterson · 32 books · 1993–2023

The Twelve Kingdoms

Fuyumi Ono · 32 books · 1991–2019

Commissario Brunetti novels

Donna Leon · 31 books · 1992–2022

Lone Wolf

Joe Dever · 31 books · 1980–2020

New Writings in SF

Kenneth Bulmer · 30 books · 1964–1977

Redwall

Brian Jacques · 30 books · 1986–2011

Jack Reacher

Lee Child · 29 books · 1997–2024

Kaguya-sama: Love Is War

Aka Akasaka · 29 books · 2016–2022

Anita Blake: Vampire Hunter

Laurell K. Hamilton · 28 books · 1988–2021

Harry Bosch

Michael Connelly · 28 books · 1992–2024

Ryanverse

Tom Clancy · 28 books · 1984–2018

The Railway Series

Wilbert Awdry · 28 books · 1945–1972

Alfie Atkins series

Gunilla Bergström · 27 books · 1972–2012

Commissario Montalbano

Andrea Camilleri · 27 books · 1994–2018

Inspector Rebus

Ian Rankin · 26 books · 1987–2022

The Black Company

Glen Cook · 26 books · 1984–2025

Vares

Reijo Mäki · 26 books · 1989–2026

Wuffle Comics

Piti Yindee · 26 books · 2012–2016

Dirk Pitt

Clive Cussler · 25 books · 1973–2019

Goosebumps Series 2000

R. L. Stine · 25 books · 1998–2000

Initial D

Shūichi Shigeno · 25 books · 1995–2021

Shannara

Terry Brooks · 25 books · 1977–2013

Son Altesse Sérénissime

Gérard de Villiers · 25 books · 1965–2013