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Prima di proporre il progetto alla Dark Horse, Mignola incontrò anche un gruppo di dirigenti della Dc Comics che apprezzarono il personaggio, ma non il riferimento all'Inferno<ref>{{cite web|url=http://www.bamkapow.com/hellboy2-tokens.php|title=Hellboy II: The Golden Army|work=Bam! Kapow!|access-date=2011-02-12|url-status=dead|archive-url=https://web.archive.org/web/20090625232409/http://www.bamkapow.com/hellboy2-tokens.php|archive-date=June 25, 2009}}</ref>.
The early stories were conceived and drawn by Mignola with a script written by [[John Byrne (comics)|John Byrne]] and some later stories have been crafted by creators other than Mignola, including [[Christopher Golden]], [[Guy Davis (comics)|Guy Davis]], [[Ryan Sook]], and [[Duncan Fegredo]]. The increasing commitments from the ''Hellboy'' franchise meant that 2008 [[One-shot (comics)|one-shot]] ''In the Chapel of Moloch'' was the first ''Hellboy'' comic Mignola had provided the script and art for since ''The Island'' in 2005.<ref>{{cite web|url=http://www.comicbookresources.com/?page=article&id=18580|title=Going to the Chapel: Mignola Returns to Drawing ''Hellboy''|work=[[Comic Book Resources]]|date=October 27, 2008}}</ref>
''San Diego Comic-Con Comics''
Con il tempo Mignola ha stretto solide collaborazioni con alcuni sceneggiatori (Christopher Golden, John Arcudi, Scott Allie, Chris Roberson) e disegnatori (Richard Corben, Christopher Mitten, Matt Smith, Laurence Campbell, Duncan Fegredo, Guy Davis, Ben Stenbeck) per lo sviluppo delle storie del suo personaggio e soprattutto dei diversi spin-off che negli anni si sono affiancati alle pubblicazioni incentrate sul solo Hellboy. Vera colonna dell'universo narrativo del personaggio è il colorista Dave Stewart che ha lavorato sulla maggior parte degli albi pubblicati dal 1996 in poi.
Il primo albo spin-off è stato pubblicato nel Marzo 1998 intitolato ''Drums of the Dead'' dedicato al personaggio di [[Abraham Sapien|Abe Sapien]]. Tra Dicembre 2001 e Febbraio 2002 è stata rilasciata la prima miniserie dedicata al [[Bureau of Paranormal Research and Defense|B.P.R.D.]] come esperimento per verificare se l'universo narrativo di Hellboy potesse includere storie che non lo vedessero protagonista<ref>Mike Mignola, Afterward from ''B.P.R.D.: Plague of Frogs'' trade paperback, February 23, 2005</ref>. Nel Dicembre 2014 debutta ''Hellboy and the B.P.R.D.'' che è contemporaneamente uno spin-off di Hellboy e di ''B.P.R.D.''<ref>{{cite web|last1=Christenson|first1=Kurt|title="Hellboy and the B.P.R.D." delves into Hellboy's—and his creator's—past|url=http://shelf-life.ew.com/2014/07/08/hellboy-and-the-b-p-r-d-delves-into-hellboys-and-his-creators-past/|website=Entertainment Weekly|access-date=July 10, 2014}}</ref><ref>{{cite web|last1=Casey|first1=Dan|title=SDCC Exclusive: Alex Maleev Talks Dark Horse's New "Hellboy and the BPRD" Series|url=http://www.nerdist.com/2014/07/sdcc-exclusive-alex-maleev-talks-dark-horses-new-hellboy-the-bprd-series/|website=Nerdist|access-date=July 10, 2014}}</ref>. Nel Novembre 2020 viene pubblicata la prima storia dedicatadel filone ''Young Hellboy'' dedicato ad un giovane Hellboy ambientatae ambientato negli anni '40<ref>{{cite web|last1=Weiss|first1=Josh|title=Mike Mignola & Tom Sniegoski Set Sail With 'Young Hellboy: The Hidden Land' Miniseries|url=https://www.forbes.com/sites/joshweiss/2020/11/09/mike-mignola--tom-sniegoski-set-sail-with-young-hellboy-the-hidden-land-miniseries/|website=Forbes}}</ref>.
This was discreetly introduced as a new cycle of ''B.P.R.D.'' when the trade come out with a number 1 on its spine and ''"B.P.R.D.: Vampire"'' written in the series box (instead of just the usual ''"B.P.R.D."''). Picking up after ''B.P.R.D.: 1948'', ''Vampire'' follows the story of B.P.R.D. Agent Simon Anders as he hunts vampires. The cycle is written and drawn by twins Gabriel Bá and Fábio Moon with Mike Mignola. Mike Mignola has said the twins have the freedom to write and draw more stories with this character if they wish.<ref>{{cite web|last=Casey|first=Dan|title=Comic Book Day: To Hell and Back with Mike Mignola|url=http://www.nerdist.com/2013/02/comic-book-day-to-hell-and-back-with-mike-mignola/|work=Interview|publisher=Nerdist.com|access-date=March 13, 2013}}</ref>
''Lobster Johnson'' is the second ''Hellboy'' spinoff, concerning the adventures of a vigilante known as "[[Lobster Johnson|The Lobster]]" from 1932 to 1939. The first ''Lobster Johnson'' story, ''The Killer in My Skull'' (August 11, 1999), was collected in trade paperback under the ''B.P.R.D.'' banner. ''Lobster Johnson'' properly became its own series when ''The Iron Prometheus'' miniseries began (September 5, 2007). John Arcudi became the lead writer with Mike Mignola from 2012's ''The Burning Hand'' onward with the stories continuing mostly chronologically from there.
The first spinoff from ''Hellboy'' centred around Abraham Sapien, beginning with ''Drums of the Dead'' (March 4, 1998)
This ''Hellboy'' spinoff primarily features stories about Sir Edward Grey, an agent of Queen Victoria and paranormal investigator, although on one occasion it included ''The Burial of Katharine Baker'', which is about another witchfinder, Henry Hood. ''The Mysteries of Unland'' was one of the few Hellboy Universe stories in which Mike Mignola was not involved in the writing. In August 2016, Chris Roberson began his run on the series in a more long-term capacity.
First published in March 2013, Sledgehammer 44 is about the Vril Energy Suit "Epimetheus", more commonly known as "Sledgehammer", set in 1944.
Altri spin-off sono stati dedicati all'approfondimento e alle avventure di diversi personaggi come [[Lobster Johnson]], Sir Edward Grey, Fiamma Nera e Frankenstein a cui si aggiungono le pubblicazioni non canoniche come i team-up con personaggi di altre case editrici (''Batman/Hellboy/Starman''), quelle derivate dalla versione animata (''Hellboy Animated''), le parodie (''Hellboy Junior'') e le storie per bambini (''Itty Bitty Hellboy'').
In 2015 a new title was released, ''Frankenstein Underground,'' following the story of Frankenstein's Monster. This character has previously appeared in ''Hellboy: House of the Living Dead.''<ref>{{cite web|last1=Zalben|first1=Alex|title="Hellboy" Creator Reveals His Next Book: "Frankenstein Underground"|url=http://www.mtv.com/news/1949036/frankenstein-underground-mike-mignola-interview/|website=MTV|access-date=October 5, 2014}}</ref> In 2020 a second miniseries, ''Frankenstein Undone'', was announced<ref>{{cite web|last1=Tweedale|first1=Mark|title=Stenbeck and Mignola Reunite for "Frankenstein Undone"|url=http://www.multiversitycomics.com/news/mignolaversity-frankenstein-undone/|website=Multiversity Comics|date=17 October 2019|access-date=18 October 2019}}</ref> and later canceled after issue #2 due to Mignola's refusal to continue working with writer [[Scott Allie]].<ref>{{cite web|last1=Gelman|first1=Samuel|title=Mike Mignola Issues Statement on Scott Allie Sexual Assault Allegations|url=https://www.cbr.com/mike-mignola-statement-scott-allie-sexual-assault-allegations/|website=Comic Book Resources|date=25 June 2020}}</ref>
'''Serie cancellate'''
Nel 2020 sarebbero dovute essere pubblicate due miniserie sceneggiate da Mike Mignola e Scott Allie, ''Frankenstein Undone'' e ''The Last Knight of St. Hagan'', ma dopo le accuse di molestie sessuali indirizzate ad Allie sono state entrambe cancellate. Della prima sono stati pubblicati i primi due albi a Gennaio e Maggio 2020<ref>{{cite web|last1=Gelman|first1=Samuel|title=Mike Mignola Issues Statement on Scott Allie Sexual Assault Allegations|url=https://www.cbr.com/mike-mignola-statement-scott-allie-sexual-assault-allegations/|website=Comic Book Resources|date=25 June 2020}}</ref><ref>[https://gizmodo.com/dark-horse-finally-cuts-ties-with-editor-scott-allie-af-1844163340 Gizmodo.com Dark Horse Finally Cuts Ties With Editor Scott Allie After New Sexual Abuse Claims]</ref>.
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