The Alcoholic: In WbN volume 2 Jack drowns his sorrows about the curse in large quantities of booze. He even drinks while driving a car.
Angst: After nearly killing Buck Jackís mood progressively edges towards suicidal. Things start to look up again, until he hits absolute rock-bottom in WbN volume 2.
Break the Cutie: In the time between volumes 1 and 2 the curse breaks Jack beyond recognition.
Character Development: Jack has been around since 1972 and has changed quite dramatically over the years. A wide-eyed teenager dragged into all kinds of supernatural mayhem against his will (1970s) → a leather-clad motorcycle riding Anti-Hero living life to the fullest (late 80s-early 90s) → a downtrodden alcoholic doing everything in his power not to have to face reality (late 90s) → a suicidal hotheaded Jerk Ass looking for a fight (late 2000s) → a pleasant guy looking after monsters when the rest of the world would rather kill them (early 2010s).
Gosh Dang It to Heck!: Jack mostly uses "stinking" to express displeasure. Possibly justified by his heightened senses, particularly smell, and his human mores remaining in effect. "Stinking" could well become quite the pejorative term if you really know how foul something smells.
I Am a Monster: It varies, but Jack occasionally sees himself as this. Other times he is more accepting of himself, crossing over into I Am What I Am; often he fluctuates between the two.
I Just Want to Be Normal: Finding a cure for his condition is what drives Jack in most of his adventures. Even though in Tomb of Terror #1 he admits he sees his werewolf side as his true self and loves the freedom it comes with, he still wants it to end.
Informed Ability: Many of Jack's powers and abilities as described in the Official Marvel Handbooks are never shown in-story. For example, it's said Jack is a practiced magic user who often casts spells, yet he is only shown doing so one single time (in Marvel Comics Presents #54).
Limited Wardrobe: While the shirt or jacket he wears (ifhe wears one) may differ, it seems Jack has stocked his wardrobe to the brink with green pants.
Magic Pants: Jack manages to ruin his clothes with alarming regularity, but in the majority of cases his pants stay firmly on.
The Nicknamer: Especially Morbius is on the receiving end of this in later years: Morb, Mikey-boy, M., Dracubilly... Ironically, in Morbius v2, Morbius responds to someone else calling him 'Mike' with "I prefer Michael."
Our Werewolves Are Different: Jack inherited the curse from his father, and is forced to change during the three nights a month the moon is full. His werewolf self grows progressively more violent over time, and the pain that accompanies the transformation increases with each full moon. He eventually gains some control over the change with the help of The Three Who Are All, enabling him to transform outside the full moon as well. For a while this control extends to no longer having to change at all during the full moon and retaining his mind at all times, but those days donít last.
Initially the werewolf looks like a typical wolfman ŗ la Lon Chaney Jr. Starting with Moon Knight #29 (1982), his appearance becomes more wolfish, still standing on two legs but with a fully lupine head. This change is explained as his werewolf self regressing ever further after an experiment to gain more control went badly.
Voluntary Shapeshifting: Jack learns how to transform any time he wants, completely or partially, and keep his mind in the process. It comes in handy.
Painful Transformation: Until he is helped by The Three Who Are All, each transformation is more painful than the last. And itís not just on a physical level: Jack describes part of the transformation as if his soul is being ripped apart. After he gains control of, the changes become more bearable. But then the full moons come with the added side-effect of glimpsing hell.
Punny Name: A jack russell is a kind of terrier. But Jack is a nickname for Jacob and Russell is the name of his step-father, so itís not like his parents intentionally named him after a dog.
Redhead In Green: The red-furred werewolf runs around in torn-up green pants a lot.
Self-Deprecation: A habit of Jackís. Upon changing into a werewolf through the sheer force of will for the first time: ďIt mightíve been the ugliest one on record, but it was still a miracle.Ē
'70s Hair: Jack (logically) sports it in his appearances during the 70s, but sometimes goes back to it in later years, notably in Witches #1 (2004) and X-Factor #242 (2012).
Slasher Smile: Jack is quite capable of them, especially in WbN volume 2. Even more so if he couples it with a couple of razor-sharp teeth.
Stages of Monster Grief: Jack goes from denial to anger to acceptance to seeing his condition as a blessing to self-destruction and back again. In Marvel Zombies 4 #3 he claims heís gone through all five stages of grief and has finally reached acceptance. Team mate Morbius thinks he simply no longer cares whether he lives or dies.
The Nose Knows: Jack has a heightened sense of smell even in human form, being able to track people and judge their emotions. Once he uses it to sniff out a pedophile purely by the scent he gives off around children, seeing right through the man's feigned disinterest.
Super Strength: When transformed Jack is capable of lifting sewer grilles "that weigh as much as your mother in law" and flipping over cars.
Super Toughness: Bullets sting, injuries hurt and "acupuncture tickles", but Jack usually stays upright throughout it all.
Walking the Earth: Jack mostly rides his motorbike across North America, but ends up in Italy on at least one occasion.
Wolf Man: How wolf-like Jack's werewolf form looks fluctuates, but he always retains somewhat human proportions, and walks on two legs. Other werewolves, even those subject to the same curse such as Jack's niece Nina, may look much more wolf-like.
Sarnak was a former sound engineer who became a villain for hire when his counterfeit production was discovered and he almost burned to death. He was hired by The Committee to cause chaos in Los Angeles. Created the Tatterdemalion, one of his former pawns.
Mind-Control Device: He uses a special "control whistle" to force derelicts, and even the Werewolf, to do his bidding.
Harlan Krueger / Hangman I
As a kid, Harlan grew to idolize silver screen heroes, and wanted to fight evil just like them. He however developed an extremely black-and-white view of the world, and became a vigilante when no law-enforcement agency wanted to hire him.
Badass Normal: Despite lacking any super-powers, he's outright beaten a werewolf and the original Spider-Woman in combat.
Death by Irony: After switching his methods to wiping out "bad influences" on society by killing the cast and crew of a slasher movie, he's stabbed to death with his own scythe by a film critic who had unwittingly fed him information.
In the Hood: He wears a hood fashioned after ones worn by medieval executioners.
The Jailer: He imprisons women to "protect from corruption of the outside world".
Knight Templar: He wants to rid the world of evil, but doesnít believe in that pesky thing called Ďthe lawí. He was even court-martialed because he killed Nazis a little too gleefully during World War II.
Would Not Hit a Girl: See Knight Templar above. Leads ot his death when he accidentally kills a woman, leaving him too overwrought to notice someone sneaking up behind him.
Steven Rand / Atlas
Rand was an actor in Hercules-esque movies who is now out of touch with reality, confusing himself and others with the roles from his last movie, and is out to get those he thinks is responsible for the accident that left him scarred.
Badass Normal: He proves to be so strong that the Werwolf has to actually run away from him.
Bad with the Bone: His character used a jawbone of an ass as a weapon, and so does he.
Bald of Evil: Justified because all of his hair has burned away.
Dr. Redditch was a scientist who sought create a way to suppress the aggressive portions of human brain. When he tries the mixture of his creation for that purpose, he chooses the wrong beaker and is turned into hulking brute who names himself DePrayve.
The Brute: DePrayve is a big brute who likes to brutalize.
An evil sorceror who seeks to kill everyone in the world and turn their souls into a personal demon army. He was formerly member of Five-Who-Are-All, a group mystical cosmic beings who banished him from their ranks.
Bald of Evil: And it is slightly larger chranium than a normal humans, since he is actually a former cosmic being.
Big Bad: Of Werewolf by Night vol. 1, as his plans pose a threat to entire humanity.
Chest Blaster: He shoots beams of "black light" out of his chest to harm his opponents.
Your Soul Is Mine: He has an ability to steal souls, which he uses to bind their owners to his will and create demons.
Marcosa was an evil aristocrat who used his status to hold parties that would end in a slaughter, and steal his victims souls afterwards. His soul still resides in his old house, and torments anyone who steps inside.
Whole Plot Reference: He's a thinly-veiled version of Emeric Belasco, the villain of the novel Hell House by Richard Matheson. The story plays out rather similarly, too, with the exception that there's now a werewolf in it and the novel's anti-psychic machine is replaced by Topaz's powers.
Combat Tentacles: He turns his hands into tentacles when he is finally forced into physical combat with Jack.