Cute and Psycho: The fairies. Most of their dialogue wouldn't be out of place in a children's fairy tale, except when they get angry or upset. And there's the fact they've murdered people in cold blood, and planned on killing pretty much everyone to restore nature.
Funny Background Event: the townspeople's screaming as the giant attacks includes gems such as "Throw prisoners and the homeless at it!", "My leg is on fire again!" and "Has anyone seen my pants?".
Gentle Giant: He's still a ruthless Blood Knight, but Baldy is the softer-spoken, more intelligent, and far more emotionally stable of the two.
Glamour Failure: Usually, Baldy's gun, being a weapon given to him by an Eldritch Abomination, is unremarked on by the people of this world. But, when Baldy points his gun in someone's face long enough, people start to question just what the hell it is he's pointing in their face. Observe
Heroic Comedic Sociopath: Both protagonists. They don't actually care why the problem exists, as long as they get their coppers.
The "Tavern Tales" guest comics tend to derail them into straight up sociopathic heroes, doing things like killing zombies even after they've been turned back into humans, since that's what they were hired to do.
Nature Hero: Baldy is supposedly one, it's part of some vague prophecy he has no idea about. The fairies are this trope gone wrong.
The Need For Mead: The Skullkickers spend a lot of time in taverns. In "Eighty Eyes on an Evil Island", they visit The Gizzard, which is every Fantasy Tavern ever. Literally.
No Name Given: Their names will appear when you're least expecting it. Until then, feel free to call them Baldy and Shorty. According the author, this is because in his experience, two close friends don't often call each other by name when it's just the two of them.
Shout-Out: Sort of, the Q&A mentions that if you think a character comes from a book, movie, game etc., the answer is "Yeah, we like that game too".
The third Tavern Tales comic has a scene where they fight zombified versions of the kids from the Dungeons & Dragons cartoon.
Strip Buffer: The comic started out in print, and still has plenty of strips waiting to be uploaded.
Squick: Shorty manages to nauseate an entire royal court with his song about the ideal Dwarven woman. invoked
Talking the Monster to Death: Shorty is facing a half-dozen guards with swords, and proceeds to lecture and mock them on how his axe is a better weapon. Then Baldy shows up behind them and kills them all with his handgun. After he rejoins Shorty, more guards show up with bows. The pair look at each other, and Baldy says what the soldiers really need is a handgun...
Title Drop: Shorty kicks in a giant's skull. It must be seen to be believed.