There are a total of 23 different Imperial Arms in Akame Ga Kill!, but we can simplify things by categorizing their physical forms:
One Cut Killer: Murasame
- Murasame is a katana that kills a living creature with a single cut. It transforms the wielder into a powerful demon if the wielder cuts themselves.
Roman Artillery: Pumpkin
- Pumpkin is a large gun that uses spirit energy to shoot concentrated shock waves. Its firepower depends on the level of danger the owner is in. It can be converted to a sniper or a machine gun.
Cutter of Creation: Extase
- Extase is a pair of giant scissors that can cut through anything. It emits a bright flash of light that is used to distract enemies. It can also be used to block attacks given its size.
Double Bladed Axe: Belvaac
- Belvaac is a double edged axe that can be separated into two. This imperial arms pursues the target when thrown.
Purgatory's Invitation: Rubicante
- Rubicante is a flamethrower that burns the target till it is killed. Its flames can't be extinguished by water. It can fire long range and has a self-destruct capability.
March of the Dead: Yatsufusa
- Yatsufusa is a katana that has the power to control eight corpses. In order for the reanimation to work, the corpses must be killed by the sword only.
Demon Armor: Incursio
- Incursio is a short sword that turns into a full-body armor when activated. Aside from the armor, it also has an ability to turn invisible, comes with an additional spear, and has an evolved form that fuses the user with the danger beast, Tyrant. This continues to evolve as a result of battles against many opponents.
Carnage Incarnate: Grand Chariot
- Grand Chariot is a cutlass that turns into a full-body armor when activated. It is more stable and has better primary stats than its predecessor (Incursio) but is unable to evolve.
Imperial Guardian: Shikoutazer
- Shikoutazer is a colossal armor equipped with different armaments throughout its body. This legendary imperial arms absorbs energy and shoot them as shock waves.
Animal King: Lionelle
- Lionelle is a belt that transforms the user into a beast. It also grants the user high-speed regeneration and enhanced senses.
Infinite Uses: Cross Tail
- Cross Tail takes form as a glove with a compartment of indestructible threads. The threads can be weaved to a weapon, an armor, or anything. It is best for creative minds.
Omnipotent Five Sights: Spectator
- Spectator is a head piece with an eye attached to the center. It can read minds, see far objects, look through things, predict a movement, and cast an illusion to the enemy.
Water Dragon Possession: Black Marlin
- Black Marlin is a ring that gives its owner the power to control any liquid.
Thousand-Mile Flight: Mastema
- Mastema is a set of discs that grows wings. It shoots feather-like projectiles capable of piercing through flesh. It can also reflect an attack.
Glorious Hands of God: Perfector
- Perfector takes the form of a pair of gloves. It dramatically enhances the speed and precision of the user's hands.
Phantasmagoria: Gaea Foundation
- Gaea Foundation is a makeup kit that enables its user to transform into any living creature.
Dimensional Formation: Shambhala
- Shambala is a purple pendant that grants its owner the ability to move through space. It can also teleport other people and objects to a place marked beforehand.
Thunder God's Rage: Adramelech
- Adramelech is a pair of golden gauntlets that generates electricity. It can manipulate the weather summoning thunderstorms at will. It also shoots powerful black electricity.
Absolute Limitation: Erastone
- Erastone takes the form of a golden ring. An eye opens in the center when it is activated. It nullifies and destroys other Teigu (Imperial Arms) but can only be used once.
The Speed of Lightning: Susanoo
- Susanoo is a humanoid that can regenerate as long as his core is intact. He has a high-level battle capability and is also good with housework. He can also absorb his owner's life force to evolve into a more powerful form. In this form, he has greatly enhanced capabilities and the ability to reflect projectiles.
Magical Beast Transformation: Hekatonkheires
- Hekatonkheires is a dog-like creature that grows into a giant muscular beast. It also has a berserk mode that further enhances its physical abilities.
Demon God Manifestation: Demon's Extract
- Demon's Extract is a demon's blood contained in a golden chalice. It grants the ability to freeze time and space. People unworthy of its powers had their thoughts destroyed and went insane.
Military Music Dream: Scream
- Scream takes the form of a black flute with red highlights. It has the ability to hypnotize people and control their emotions. It can also enhance the user's physical strength.
Want more options? Read the manga. The original manga of Akame Ga Kill! features a slightly different story than the anime. Dig up the chapters to find more of these legendary weapons!