Badass Normal: While he does have some powers, they're very minor compared to everyone else.
Blood Knight: He dedicates his entire life to fighting bad guys, with only two minutes of sleep each night, he's stated that he'd get bored if he became president and killed all the bad guys, and if he had a magic wand, he would use it to turn every alien in the universe evil just so he could kill them.
Wig, Dress, Accent: Axe Cop uses a variety of disguises at his disposal. He dresses up as a cat while killing bad guys in their sleep at night, he occasionally wears a baby suit, he dresses up as Ethan for comic conventions, and he occasionally disguises himself as a regular cop (he switches his axe with a gun).
Flute Cop (Flutey Smartist)
Butt Monkey: He never stops transforming. Although many of these forms make him even more powerful, he never gets to use his true form, even when he tries. Even Axe Cop has stated that his best friend is Sockarang and not Flute Cop, who has been his sidekick since the first comic.
I Have Many Names: Due to his many transformations. The same character has gone by the names Flute Cop, Dinosaur Soldier, Avocado Soldier, Uni-Avocado Soldier, Ghost Cop, Drag-Tri-Ghostacops Rex, Viking Cop, Bear Cop, Zombie Bear Cop, President Zombie Bear Cop, Rat Cop...
Luke, I Am Your Father: He's Axe Cop's brother, but they forgot after backing into each other.
Minored in Ass Kicking: His minor was in Criminal Justice. His major was in flute class. However, it appears that flute classes in the Axe Cop world involve learning how to fight with flutes.
Musical Assassin: While we've never seen him use his Flute Cop form in battle, his fighting style evidently involves him distracting people by blowing into his flute.
Our Presidents Are Different: He became President of the United States by eating President Towzerd's brain. (He was a zombie bear at the time.)
Shapeshifter Default Form: Interestingly, in between storylines he seems to revert by unspecified means to a default form...but that form is Dinosaur Soldier, not his original form of Flute Cop.
Legacy Character: His father was a sock fighting superhero before him.
Bad Guy Earth clarifies that while his whole family were converted into sock fighters, his father only ever taught superheroes without being one himself.
Out of Focus: After the first arc left him a tiny biting robot, he didn't reappear until a later comic demonstrated his battle cry, which also included defunct forms of Flute Cop. An even later comic showed that he got better and is still alive.
Ninja Pirate Zombie Robot: Lampshaded by the narrative text. They were "wizard ninja brothers from the moon" even before they started getting vampire bites anf transformations.
Omniglot: They speak every human and alien language due to doing ESL at moon school.
Our Werewolves Are Different: Vampire Wolfer was born a werewolf and can change at any time because he lives on the moon.
Expy: When he first appeared on Ask Axe Cop, he showed traits very similar to Axe Cop. He even had an airborne tyrannosaur as a steed—specifically, his Bat Warthog T-Rex. These were dropped when he got his own arc.
Mix-and-Match Critters: Bat Warthog, which is "the best two-animal combo" according to Malachai.
Our Werewolves Are Different: Sort of. He only turns into his bat warthog form at night, because bats go out at night, and he was bitten by a bat warthog.
Shaped Like Itself: A literal case: Bat Warthog Man wears a bat warthog mask to cover his bat warthog face. It's justified, too: his mask is more stylized, whereas his head is slightly more grotesque.
Ensemble Darkhorse: Just after his first appearance, he became stupidly popular from one dialogueless panel alone.
Real Men Wear Pink: Before becoming a chihuahua himself, he was a tough, muscular, mustachioed army man...who owned a pet chihuahua. There's something inexplicably funny about seeing such a manly man say "Oh no! I forgot to feed my chihuahua!"
Superhero Packing Heat: Has "army powers", which essentially seems to mean the ability to use a machine gun while in chihuahua form.
Portmanteau: His name is one of 'lion' and 'cyborg'.
Was Once a Man: The result of Grey Diamond combining the remains of his deceased friend Sergeant G (actually Sergeant T, but Grey Diamond didn't know that) with parts from a lion, a cheetah, and a robot suit.
Who's Laughing Now?: He only became a bad guy after Axe Cop refused to let him on his team, at first because he had to go fight Psydrozon and then because he was already powerful enough to go without him.
In fairness, he didn't actually finish saying "a unicorn horn" before he was killed by Uni-Man being thrown at him, so he was already doomed before starting to say it.
Dr. Stinky Head
Arch-Enemy: Seeing as he has connections with Axe Cop and appears in the Dr. McNinja crossover, he's about the closest Axe Cop has.
Magitek: They use combinations of both technology and magic, such as setting up ordinary technological booby traps but then hiding them with an invisibility spell.
Later they build a transformation machine and install the last button using a magic spell.
Characters that have only appeared in Bad Guy Earth and other print-only comics. Because these are self-contained stories, spoilers will not be marked.
The Psychic Brothers (Psychic Boss and Psychic Helper)