Milk Weapon Soul

Key: Sanguine415
Character: Milk
Skill(or transformation): Weapon soul; shooting for Muramasa in the long term as a skeleton. The sort that looks at being the grim reaper as a day job, punch clock 9-5, but does his duties with extreme prejudice.
How well do you know the source material?(obviously not relevant if it's a transformation): If we're talking the historical Muramasas, those were considered cursed, blood lust laden blades of death as propaganda with the anti-Tokugawa movement. It also has to draw blood in legend before being returned to its sheathe; a fitting quality for a grim reaper.
Reasoning:
Milk is an undead, particularly a skeleton that died of starvation in a tribal prison of war camp a long, long time ago. Having rotten to the bone, he stirred from consciousness eons later without calling or purpose, wandering the lonesome, lonely rode of a man out of time.

Attempting to reap the idiotic boy Billy, his failure in a game of pebble tossing compelled him to a contract of the horrid, binding servitude known as "friendship". He is forced to follow the fool along on his mindless endeavors.

This has led him to enlist with the Navy of the city, acquiring a fancifully scientific blade that felt almost souless in a manner, possessing strength at the cost of what made a sword a true companion. The glimmer of steel, poetry in motion.

This has also led to a fondness for the hot dog entrepreneur, having offered her a grim insight into his past after the naval meeting. Mulling upon the meaning of life and unlife in a manner that bordered on melancholy.