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And Your Reward Is Clothes: Each character will have alternate skins on the game's release, unlocked by completing in-game achievements. Until then, characters have a random chance of starting the game with their alternate skin during Early Access.
All There in the Manual: Most everything about the characters. Things like Steroids being a doctor, Fish having been a police officer and even a few character's genders are never mentioned during gameplay, or at best hinted at in the loading screen hints.
Awesome but Impractical: Lightning guns. They fire a multi-hitting bolt of energy, but it functions much like lightning really would by routing to the nearest object. This means in narrow corridors it'll often arc away from your target and into a wall
Bling-Bling-BANG!: Y.V. starts off with a golden revolver, in keeping with his "money to burn" characterization. Other characters can also find rare golden weapons, which have minor improvements over the originals such as increased rate of fire.
Body Horror: Melting, Eyes, and a few other enemy mutants.
Boring but Practical: Melee weapons. Compared to the other, more unique weapons, they can be fairly underwhelming. But they can block enemy fire and kill most enemies that you encounter in one or two swings.
Bullet Time: Chicken's special power. Upgrading it gives her a normal rate of fire while using it.
Cast from Hit Points: The Rebel's minions are summoned for the cost of 2 HP each, and the Blood Launcher is an explosive weapon that uses your own HP as ammo when the regular ammo runs out.
Cast From Experience: The Horror can fire a beam of radiation that reduces his EXP bar. Upgrading this ability makes radiation containers hold more EXP, meaning more radiation to fire.
Damn You, Muscle Memory: Robot's special ability is to devour his current gun for ammo and/or health. This is incredibly useful, but if you had just played someone like Fish or Crystal who use their abilities much more liberally, you may end up chowing down on your gun in the middle of a fire fight.
The Dev Team Thinks of Everything: In update 25 of the game, Vlambeer added footstep sound effects, which changed based on what sort of surface players walked on. In update 27, getting the Extra Feet mutation gave you more footsteps.
Rebel has a B-skin which gives her a winter coat. What happens when you reach the frozen city with her? She puts on the hood over her head.
Whenever Robot levels up, the "select a mutation" screen is rewritten to say "install an update".
The hidden underwater "Oasis" zone has every playable character and bandit in it encased in a bubble except for Robot and Fish, who obviously don't need it to breathe.
Drop the Hammer: There's a sledgehammer that can be picked up in the middle of the game, and an energy hammer you can pick up later.
Dual Wielding: The unique ability of the Steroids character; all other characters can only have one weapon in use at a time.
Flechette Storm: The Splinter Guns fire multiple smaller bolts like a shotgun.
Frickin' Laser Beams: Weapons that use energy ammo fall under this category, and the mutation Laser Brain increases the effectiveness of all of them.
I Love Nuclear Power: Radiation is the name of the game: all enemies drop it, and it functions as the game's exp system, with you being able to select a new mutation with each level.
One of the playable characters, Horror, is a monster made out of radiation.
Joke Weapon: The Screwdriver. It has short range, can only hit enemies head-on, as opposed to the wrench, sledgehammer and shovel, which hits enemies on a wider radius, and it's one of the weakest of the melee weapons. However, it can be used to repair a car in the scrapyard, which takes you to a mansion where you can find a golden weapon.
Kaizo Trap: The Dog boss of the scrapyard goes out in a series of spectacular explosions. These can kill you.
Also, if a next level portal appears next to a car, it can blow up the car while drawing you in, killing you.
The Hunter in the frozen wasteland loses control of his jetpack when you kill him, he can crash into you and explode.
The throne itself
Magikarp Power: Melting starts the game with 2 HP (For reference, a single bullet does 3 damage), but he gains levels much faster. If you can survive a few levels, he becomes incredibly powerful, especially if you can upgrade his special power to deal tons of explosive damage at no ammo cost.
More Dakka: Many weapons in the game have an automatic counterpart, which fires continuously as long as the attack is held, or an assault counterpart, which fires multiple rounds with each shot. Y.V.'s special attack also lets you fire two shots at once, and can be upgraded to four shots. Steroids can upgrade his special attack to get 20% of every shot free and make every weapon fully automatic, making the normal auto (and less accurate) variants of each weapon redundant.
One Hitpoint Wonder: Melting, in spite the fact he has 2 HP still is this due to the fact that everything (except touching maggots, being in fire for a short period of time, and a few others) does more than 2 HP in damage.
One-Hit Polykill: Crossbows can pull this off with smaller enemies, while the Heavy Crossbow will pierce through just about anyone.
Retirony: Fish was a cop one day from retirement before the apocalypse hit. He's not dead yet, of course, but this is a roguelike...
Revolvers Are Just Better: Every character has a revolver as their starting weapon, except for the Chicken, as mentioned above. Y.V.'s happens to be made of gold. Averted since these are their starting weapons and as such usually the weakest weapon in their arsenal.
Samus is a Girl: Crystal, Chicken and Rebel are all female, but you'd never know that unless you looked it up. Well, there's the fact that chickens are Always Female, but even then.
Shotguns Are Just Better: There's a wide variety of shotgun-based weapons, ranging from the traditional kind, to a slugger that fires one giant shell, to a flak cannon that fires one shell that explodes into multiple shells on impact.
Shout-Out: the Disc Gun, Minigun and Laser Cannon from Super Crate Box make a reappearance, and Yung Venus from their previous game Gun Godz is now a playable character.
A secret exit portal in the sewer level takes you to a bonus room where the only enemies are four turtles and a rat.
Bullets: The most basic of weaponry, starting with the regular Revolver, and subsequent guns firing more and more bullets at a time, leading up to the Minigun or the Hyper Rifle, which shoots five bullets at once, and has autofire. Its special mutation is the Recycle Gland, which gives you a chance of recovering any bullet that hits a target. (The Pop weapons fire shotgun-like pellets despite using bullet ammo; they aren't affected by Recycle Gland, but they are affected by the Shell's special mutation, seen below.)
Shells: Shotguns of all shapes and sizes, which vary between firing either regular pellets, which hit in a spread, flame pellets that ignite on contact, or slugs, which are single heavy shots with enough force to kill giant scorpions in one hit. These shots have less range than other weapons, but bounce off walls, making them useful for closed spaces or crowd control. The Shotgun Fingers mutation increases their range.
Bolts: Crossbows, obviously. These weapons come in either traditional bolts, which fire straight with perfect accuracy and pierce through small enemies killing them instantly, or splinters, which fire in a spray similar to the shotgun. Also includes the Toxic Bow, whose bolts release poison gas on impact, and the Disc Launcher, which fires bouncing buzzsaws of friendly fire death. The Bolt Marrow mutation gives bolts slight hoping capabilities.
Explosives: Grenade Launchers of various types, with an obligatory Sticky Bomb variant, a mini grenade variant whose weapons fire multiple grenades at once, and one that also releases poison gas on detonation. The only weapon class capable of destroying terrain by itself. Curiously, Flamethrowers and Flare Guns use this ammo type too, as well as the Jackhammer, despite being a melee weapon. Its special mutation is the Boiling Veins, which makes the player immune to fire and explosions when at or under 4 HP.
Energy: Laser weapons which fire single piercing beams, plasma weapons which fire balls of energy which eventually explode, an orbital strike Ion Cannon, and lightning weapons that home in on objects. Similarly to the Explosives above, the Energy Screwdriver, Energy Sword, and Energy Hammer are all melee weapons which use Energy ammo. The Laser Brain mutation increases the strength and duration of all energy attacks.
Stuff Blowing Up: The entire line of explosive-based weapons, and Melting's special attack, which blows up every corpse on screen.
Summon Magic: Rebel's special attack summons a bandit to fight on her side, for the cost of 2 HP for the first on stage, and 1 HP for all additional bandits while at least one is on stage. Upgrading her ability increases their fire rate.
Tentacle Rope: Plant's special ability ensnares enemies in vines. When upgraded, the vines grow thorns that deal damage as well.