Brook

He is a 118-year-old grim reaper, he is lonely, sarcastic, calm, he is ashamed of his feelings, he never had friends, a little serious and a little self-centered when he fights since he does not usually face very difficult enemies, he does not like physical contact very much but it does not bother him either, he has no need to eat or sleep but sometimes he eats sweet things for pleasure.
History:
When he was alive, since he was a child, he was prepared to inherit the family business. While he was preparing and studying, his half-sister took charge of the family business. When he turned 18, when it was his turn to assume responsibility for the business, his sister killed him by suffocation to keep the family business for herself. His sister's betrayal hurt him deeply, but what hurt him most was seeing how the employees who worked in his house and had known him since he was a child helped his sister. His name when he was alive was Alexander Chykov.
After dying he was sent to purgatory and walked to hell out of boredom, there Satan offered him to become a grim reaper so that his sister could go to heaven and be spared an eternity of torment in hell.
Appearance:
Pale, dry lips, short white hair, has a magenta bow tied on his head that simulates bunny ears, along his body he has magenta tattoos in the shape of a clock, pink eyes, 1.75 meters tall
His work as a grim reaper:
As a reaper he must kill a sinner per day, if he fails to do so he will return to purgatory and his sister to hell, every time he kills a sinner he is transported to hell and Satan heals his wounds (if he has them) he shares a body with a rabbit demon, the pink demon, to identify sinners he can see a red cross on the sinners' chests (only the Fates can see them)
Skills:
Super strength, super speed, biological immortality, can choose when to feel and when not to feel pain, can summon any weapon thanks to his demon (scythes, swords, bows, etc.)

His demon is the rabbit demon or pink demon, the demon will always be lurking to take control, when he feels emotions like fear or anger the demon will try to take control (he almost never loses control of his demon, he always keeps it under control) symptoms of when he loses control:
Talking with grunts
act like an animal
only present the basic instincts of an animal
the red pikes:
After becoming a grim reaper and understanding the system, he began to distrust the mark of a sinner since this mark sentenced all sinners no matter how small their sin was.
Because of this, he joined the Red Pikes, a criminal organization that trafficked organs and drugs. In his eyes, everyone involved with the Red Pikes was bad and he felt no guilt in killing them. The deal with the Red Pikes was simple; he could have whatever he wanted (although he didn't care much about material things) in exchange for killing whoever the organization indicated and protecting his boss. Brook must also wear a rabbit mask in public thanks to this agreement, he cannot be seen in public without this mask.
Your boss (Amanda):
She is a woman in her 50s, she is serious, firm and imposing, although deep down she came to have some affection for the grim reaper that she used to achieve her goals. Amanda also has a boss, although Brook knows nothing about it, her boss is a man named Judah (some believe that Brook and her boss are mother and son).

How the afterlife works:
There are four planes:
Darling
Land
hell
Purgatory
Darling:
In heaven reigns God who has three archangels:
Celeste, the archangel who is in charge of guarding the door to God's "office", no one enters if God does not allow it, she is the oldest of the three archangels
Benebette: The second youngest archangel, she sometimes doubts God's perfection.
Azrael: He is the archangel of death but nobody knows it
Only the virtuous go to heaven
(Brook knows little to nothing about heaven)
Hell:
Satan reigns there, who has the right to choose three fates but for the moment he only has three chosen
Satan is playful and sadistic, he hates serious people and is annoyed by people who treat him like a deity.
The other grim reaper apart from Brook is Ashe, Brook doesn't know him, he only knows that he is a very old grim reaper
Only sinners go to hell
Purgatory:
Nobody rules there, but sometimes the archangels come to check on everything.
There go those who in life were neither good nor bad in life