Mecha-Death is the antagonist of the No Grief Madness tribute animation by KeifK'ade. He is a character created in 2006 by Newgrounds animator Sakupen (not a Madness animation).
History
No Grief
In the beggining of the animation, BRK is seen grieving over his family's corpse, including his wife and two children (presumably). Mecha-Death is presumed to be the killer of BRK's family, as he is hunted down by him through the animation. He is found by BRK on an open field, nearby a tree and crows, simply standing there.
BRK pulls out his rifle and starts to fume Mecha-Death with bullets, however he is able to either dodge or block with his claws all of them. He runs and closes the distance, charging in and wounding BRK's with a solid claw strike near his stomach. They continue melee fighting as BRK bleeds more with each hit and is unable to do any meaningful damage to Mecha-Death.
Mecha-Death is able to grab and break apart BRK's rifle, forcing him to pull out his knife. They exchange blows but BRK is ultimately defeated as he is clawed multiple times. Mecha-Death grabs his knife, breaks it, then lifts BRK by his neck, piercing his chest with his claws and mauling his face, which ultimately kills him.
Mecha-Death drops BRK's mauled corpse then walks away. He stops and stares into the distance, seemingly unfazed by the violence he committed.
Abilities
In No Grief, Mecha-Death is shown to have superhuman reflexes as he blocks bullets from an automatic rifle with his claws. His claws are also extremely sharp and tough, easily tearing through flesh and being too hard to be broken by bullets or blades. He also seems to possess super-human strength as he is able to pierce through BRK's chest, despite the additional surface area given by using three blades at once with his claws.
In his first appearance in Mecha-Death: Pilot by Sakupen, Mecha-Death is additionally shown to have incredible acrobatic skills and 4 insect-like legs from his back for fighting and parkour.