- Anti-Climax Boss: Despite years of build up, staying off screen and being the cornerstone by which much of Hellboy's mythology is based, Satan goes down incredibly easily. Of course, it's a Justified Trope, because he dies like just like King Duncan, in his sleep.
- Complete Monster: In the dark world of Hellboy, Nimue, the Queen of Blood, reigns supreme as the greatest monster. Once a mighty sorceress who betrayed the great Wizard Merlin and imprisoned him to live eternally in his own grave, Nimue was imprisoned for 1,500 years by the witches of Britain. Upon her revival to lead the Wild Hunt, Nimue destroys the other witches of Britain and sets about marshaling an army of the Fae. When one ambassador comes to her to say his king will stand with her, Nimue forces him to murder his king, come out his heart and forge her a new crown with it. Nimue launches vicious purges to ensure there is no threat to her rule, intending to exterminate humanity to the last man. When defeated and being dragged to hell by the witches she'd murdered, Nimue spitefully tears out Hellboy's heart to ensure she won't face damnation alone.
- Ensemble Darkhorse: Karl Ruprecht Kroenen, Kate Corrigan.
- Holy Shit Quotient: The vision of the apocalypse in King of Fear, not to mention Hellboy paying back the Baba Yaga... with his *own* eye.
- Some Anvils Need to Be Dropped: You ultimately do have a choice on what to do with your life, no matter how many times you're told otherwise.
- What Do You Mean, It Wasn't Made on Drugs?: Read the "Our Angels Are Different" entry.
- The Woobie: Hellboy and Abe inform the captured Daryl that they will have to keep him imprisoned indefinitely, because killing him will only move the curse. They also tell him that his memories of his family will probably start to slip away, and leave him with a family photograph so he can try to remember.
- Awesome Music: The score for The Golden Army is very good. Then again it is Danny Elfman, what did you expect?
- Same goes for the first movie. The music playing during the funeral and the end kiss scene alone are great.
- Draco in Leather Pants: Prince Nuada, naturally enough for an expy of Elric.
- Engaging Chevrons: Parodied in the first movie, a guy with a high-tech flamethrower backpack goes through a long, drawn-out start-up sequence, only to be eaten by the thing he's trying to kill before he can use it.
- Ensemble Darkhorse: Kroenen, for being an Adaptational Badass and Creepy Awesome clockwork zombie.
- Even Better Sequel: Despite diverging even more from the source material, The Golden Army is liked just as much as, if not more so, than the first film.
- Although it's notable that Mignola eventually eschewed the pulpier villains and Nazis of the earlier stories for a similar path through folklore and mythology, while the BPRD series handled threats that had been notched up early in Hellboy's run.
- Ho Yay: It says something about the writers (or maybe the actors) that one of the most romantic scene in the either of the films is two dudes getting drunk and singing "Can't Smile Without You" to each other.
- Jerkass Woobie: Nuada.
- Magnificent Bastard: Nuada again. He's a genocidal dick, but you can see where he's coming from.
- Moral Event Horizon: Prince Nuada starts off by unleashing a swarm of ravenous tooth fairies in a room full of people, the tooth fairies ate every last bit of everyone in that room till there was nothing left of them. There is absolutely no purpose to this either, as he already has what he came for. He does it just because they're humans.
- Periphery Demographic: The first film received a good review from Focus on the Family, of all people.
- Tear Jerker: Nuala's sacrifice, particularly because it makes Abe of all people shed a tear.
- The death of Professor Broom in the first film.
- Ugly Cute: "I'm not a baby, I'm a tumour."
- Nuada, if you're not tired of yet another Well-Intentioned Extremist ranting against the black and white evil that is humanity.
- Visual Effects of Awesome: And relatively small budgets.
The animated films:See here.
The video games:
- The Problem with Licensed Games: Both Hellboy games had outdated graphics and repetitive gameplay, and the first one was full of bugs. Although The Science of Evil was supervised by Mignola and Del Toro, it didn't make up for the programming shortcomings.