The Apathy are Grimms that drains the will from their victims and kills them, but the Greeeds were able to destroy them and burn the farmhouse down and found out the owner was responsible for this, but they didn't notice that three of them survived and were encountered by Kiyoto Maki and turns them into Yummies to kill the ones responsible for the destruction of their kind.
Personality:
Cruel, heartless, sadistic, and vengeful. They now chase the ones that are responsible for killing their brethren and now they're on a hunt. They also enjoy making people suffering to despair and kills them without hesitation and viewed each other as brothers, but despite being different, they share a bond. The first brother is the leader and revels in glee as he watched those he slain writhe in pain, the second brother is completely unpredictable and can be trigger-happy and takes an interest in guns, and finally the third brother can be a bit sadistic, but has a sense of honor and finds the Bushido Code to be interesting.
Powers and Abilities:
Apathy (1st):
Invisibility: Like common ghost, it can turn invisible for silent kills.
Master Hand-to-Hand Combat: Surprisingly, it's able to handle itself well in a fight and it's fighting style is similar to Kamen Rider Ghost.
Will Absorption: It can also absorbed the will of others to empower himself.
Communication: It's able to speak perfect English which is surprising since Grimm Yummies are unintelligent.
'Rider Kick': Surprisingly, it's able to perform a Rider Kick by charging itself through the use of the Salem's Emblem and his foot is covered in black flames and can perform a triple Rider Kick with his 'brothers'.
'Rider Punch': Covers his fist in the color flames as his 'Rider Kick'.
Apathy (2nd):
Invisibility: Like common ghost, it can turn invisible for silent kills.
Will Absorption: It can also absorbed the will of others to empower himself or to charge up his gun.
Communication: It's able to speak perfect English which is surprising since Grimm Yummies are unintelligent.
Stealth: Can be quite sneaky in order to deliver a silent kill.
Basic Hand-to-Hand Combat: Has some grasp of hand-to-hand combat and is pale comparison to his 'brothers'.
Skilled Marksmanship: Handles a gun and is on par with Ruby.
'Rider Kick': Surprisingly, it's able to perform a Rider Kick by charging itself through the use of the Salem's Emblem and his foot is covered in blue flames and can perform a triple Rider Kick with his 'brothers'.
'Rider Shooting': Can fire blue bullets with his shotgun or rifle.
Arsenal:
Phantasmal Shotgun: Personal weapon.
Phantasmal Rifle: Secondary weapon.
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Apathy (3rd):
Invisibility: Like common ghost, it can turn invisible for silent kills.
Will Absorption: It can also absorbed the will of others to empower himself or to charge up his sword.
Communication: It's able to speak perfect English which is surprising since Grimm Yummies are unintelligent.
Master Hand-to-Hand Combat: Surprisingly, it's able to handle itself well in a fight.
Skilled Swordsmanship: On par of a master swordsman and can be quite deadly with a blade.
Shadow Teleportation: Allows him to teleport instantly by diving into his shadow
'Rider Kick': Perform a Rider Kick by charging itself through the use of the Salem's Emblem and his foot is covered in red flames and can perform a triple Rider Kick with his 'brothers'.
'Rider Slash': With its sword covered in red flames.
Tsubame Gaeshi: Surprisingly, he learns Kojiro Sasaki's famous technique. It allows him to fly downwards and upwards in high speeds while slashing the target. An energy aura taking a form similar to a bird surrounds the user during the attack.
Arsenal:
Shadow Blade: Personal weapon.