Arm are Soul-Bound Weapons that can be living or non-living the type of Arm you have is detirmind by your personality
Spirit based Arm can grant you many power like[List below]
This type of Arm is only used by the strong but here are the powers [Below]
Weapon based Arms are used by the grand Army
Human Arm are very common and you just might be one
Non-human Arms are common but no one has one that we know of but here are the powers any ways
Well the name speacks for itself
This speaks for itself there are none with an omnipotent arm
Nnoritora is the only person with this because she is one
songThis is one one Marvel has it is rare but can be powerful heres an song to help you understand it more.Sound Manipulation/Voice Manipulation and Empathic Power-Shifting/Empathic Weaponry/Empathic Mimicry are yours to manipulate with and you even can get Superpower Manipulation but last but not least Musical Empathic Projection/Musical Animation/Self-Ability Bestowal!!:) Hope you like the examples of music you can start with!
This is also an rare one but not much is known about this one....