Below is a complete list of the costumes that you can unlock in the game. Access the costumes screen via the batcomputer. This list contains the cost of the costumes as well as their effects.

Costume	Cost	Effect
Agent Liberty's Battlesuit	200 Metro	Increases melee damage and health, grants flight.
Ambush Bug Costume	400 Gotham	Ambush Bug will teleport to your aid when you're in a fight.
Animal Man Costume	200 JL	Increases melee damage and slightly increases health. Increases movement speed and grants flight.
Aquaman Costume	300 JL	Nearby fish will protect you! Swimming speed increased. Can confuse enemies via telepathy. Melee damage increased. Tritent can be used for water and lighting attacks.
Atrocitus Costume	200 JL	Red beam and construct weapons for melee. Melee damage, health and movement speed increased. Grants flight.
Azrael Batman Costume	200 Gotham	Increases melee attack with ranged attack and close range flame thrower.
Azrael's Armor	200 Gotham	Increases melee damage with flamethrower attack. Slightly increases health.
Azrael's Suit of Sorrows	200 Gotham	Outfits Maxwell with a pair of swords and slightly increases health.
Aztek Battlesuit	300 Metro	Yellow plasma beam attacks and occasional invisibility. Increases melee damage, hitpoints and speed. Grants flight.
Bane Costume	400 Gotham	Grants super strength. Body slam attack. Increases melee damage and slightly increases health.
Batman Costume	300 Gotham	Batarangs for ranged attacks and ability to disarm opponents with guns. Increases melee damage and slightly increases health. Improves movement speed and provides smoke bomb effect that confuses enemies.
Blue beetle Costume	200 Metro	Shoot energy beams. Increases melee damage and grants flight.
Blue Lantern Costume	200 JL	Blue beam attack. Green Lantern companion spawned to fight for you. Increases health, improves movement speed and grants flight.
Booster Gold Costume	300 JL	Laser attack. Spawns sidekick (Skeets). Slightly increases melee damage and health. Increases speed and grants flight.
Braniac Five Costume	200 Metro	Small increase to melee damage and very large increase to health. Grants flight.
Bushmaster's Costume	300 Metro	Poisonous gun attack. Slightly increases melee damage and health. Increases movement speed and grants flight.
Catwoman Costume	200 Gotham	Clawing attack. Slightly increases melee damage. Increases movement speed.
Clayface Costume	300 Gotham	Grow in size when attacking. Increases melee damage and health.
Cyborg Costume	300 JL	Multiple laser attacks. Increases melee damage. Slightly increases health. Improves movement speed.
Darkstar Exomantle	400 Metro	Orange beam attack. Increases melee damage, health and movement speed. Grants flight.
Doctor Fate Costume	3000 JL	Variety of energy based attacks. Increases health. Grants flight.
Doomsday Costume	300 Metro	Super strength. Greatly increases melee damage and health.
Firestorm Costume	400 Gotham	Fireball attacks. Increases melee damage. Slightly increases health. Grants flight.
Flash Costume	400 JL	Incredible Speed. Increases melee damage.
Green Arrow Costume	300 JL	Green Arrow bow (never breaks). Slightly increases melee damage.
Green Lantern Costume	200 JL	Green beam and construct attacks. Slightly increases health. Increases movement speed and grants flight.
Harley Quinn Costume	200 Gotham	Mallet for melee combat and gun for ranged combat. Provides resistance to some poisons.
Hawkman's Armor	300 JL	Nth Metal Mace attacks. Slightly increases health. Increases movement speed and grants flight.
Indigo Tribe Costume	200 JL	Indigo beam attack. Mimic the powers of any other Lantern Corps member you are near. Slightly increases melee damage and health. Grants flight.
Ion Costume	3000 JL	Green beam attack. Increased melee damage. Slow down enemies that come near you and heal nearby allies. Grants flight.
Joker Costume	1500 Gotham	Chattering teeth attack (long range) and laughing gas attack (makes people fall over laughing temporarily). Chattering teeth might burst into harmless confetti or unleash a lethal explosion.
Lex Luthor Costume	1500 Metro	Laser and kryptonite beam attack. Increases health and greatly increases melee damage. Grants flight.
Lobo Costume	300 JL	Super strength. Greatly increases melee damage and health. Improves movement speed.
Martian Manhunter Costume	1500 JL	Eye beam attack. Occasional invisibility and ability to temporarily paralyze enemies. Increases melee damage and health. Grants flight.
Mister Miracle Costume	300 JL	Yellow blast attack. Increase health and greatly increases melee damage. Increases movement speed and grants flight.
Mr Freeze Costume	300 Gotham	Freeze gun. Maxwell is resistant to freezing effects. Increases melee damage and slightly increases health.
Nightwing Costume	200 Gotham	Batarangs for ranged attacks and tonfa for close combat.
Orange Lantern Costume	3000 JL	Orange beam attack. Defeated enemies will become orange avatars of themselves that will fight for Maxwell. Small increase to melee damage and health. Grants flight.
Parallax Costume	3000 JL	Scares those nearby for a time. Draining attack (heals Maxwell). Increases melee damage and grants flight.
Penguin Costume	300 Gotham	Umbrella gun. Penguin (the bird) will tag along and protect Maxwell.
Plastic Man Costume	300 JL	Makes Maxwell a bit stretchy. Increases melee damage and health.
Poison Ivy Costume	400 Gotham	Spawns carnivorous plant to protect Maxwell. All plants will protect Maxwell. Slightly increases melee damage and health. Melee attacks will sometimes poison enemies.
Predator Costume	200 JL	Violet beam and construct attacks. Slightly increases health. Increases movement speed and grants flight.
Red Hood Costume	300 Gotham	Knife attack (close range), gun attack (long range). Slightly increase melee damage and health.
Riddler Costume	200 Gotham	Throw explosive puzzle pieces.
Robin Costume	200 Gotham	Batarangs for ranged attacks. Slightly increases melee damage.
Scarecrow Costume	300 Gotham	Fear Toxin attack (scares opponents). Slightly increases melee damage.
Shazam Costume	300 Metro	Super strength. Greatly increases melee damage and health. Increases speed. Grants flight.
Shining Knight Costume	300 JL	Attack with Shining Knight's Sword. Shining Knight's Pegasus will protect Maxwell. Greatly increases health.
Sinestro Costume	200 JL	Yellow beam and construct attacks. Slightly increases health. Increases movement speed and grants flight.
Solomon Grundy Costume	300 Gotham	Super strength. Greatly increases melee damage and health.
Starman Costume	200 JL	Fire energy blasts. Slightly increases melee damage and grants flight.
Starro Costume	1500 JL	Multiple beam attacks. Spawns a Starro minion to fight for Maxwell. Slightly increases health and grants flight.
Superman Costume	250 Metro	Heat vision and ice breath attacks. Greatly increases melee damage and health. Increases speed. Super strength. Grants flight.
Swamp Thing Costume	300 JL	Nearby plants will protect Maxwell. Greatly increases melee damage and health.
Two-Face Costume	1500 Gotham	Maxwell always has a machine gun.
Wonder Woman's Battle Armor	300 JL	Greatly increases melee damage and health. Increases movement speed and grants flight.