Somewhere in space
How long was it now since he started floating through space? At least a few centuries, of that he was sure. Are they still remembering his crew? Still singing songs of their legendary journey? About how they all achieved their dreams.
Even after all this time, tears still sprang to his eyes when he remembered how he finally managed to fulfill the promise he and his first crew made to the whale calf they met by chance.
After the Strawhats achieved their dreams and goals they still traveled together across the wide seas, living through one adventure after the other.
But then, after several decades, the harsh reality of life caught up to the legendary Strawhats. One after another they passed away, peacefully in old age, surrounded by friends and family.
The last two to depart to the afterlife were the captain and his first mate. And after them, Brook was once again all alone. But this time, He wouldn't mourn them forever. Instead, he would remember them fondly, being happy that they had such a fun time together.
Brook then spent another two centuries traveling across the world alone, singing happy songs about his beloved Nakama. Through this, he created an immortal legacy of the Strawhats.
Brook scoffed. Immortality, something so many desired, but none of them realized what kind of curse it could be. Unknowingly, Brook managed to awaken the true power of the Revive fruit. Since his soul got lost in the fog where his ship was, his body was reduced to bones when he finally found it again. Since bones don't need as much nutrients as a whole body does, Brook was able to survive on a deserted ship until he joined the Strawhats.
However, when he trained his Devil fruit for two years and managed to awaken it completely a few months later, he discovered that he was unable to die. Should his bones get damaged, his soul would fix them immediately. Bones need 80 years to rot, and that was also a huge maybe in His case.
Now, while Brook was traveling the world, singing songs of praise to the Strawhats, a giant meteor impacted into the Redline. It destroyed the continent completely, but it also caused Brook to get launched into space on a large chunk of red earth. And since then he was floating around, feeling even more bored than on his ship in the Florian Triangle. He remembered what Robin once told him. In space it was cold and there was no air, so anything that was in space would be perfectly preserved. That's why he, his trusted sword Soul Solid and his treasured Violin were still in perfect shape.
Stretching his limbs, Brook turned around and fell back asleep. Because of that, he failed to realize how his rock was picking up speed and heading towards an island on a blue planet.
Hogwarts, 2nd of May 1998
Harry and his allies were preparing themselves for the final fight. This would be the end of the war, one way or the other. All of Voldemort's Horcruxes were destroyed, except his Snake Nagini. He was coming to Hogwarts, with all his Death Eaters.
The teachers and some older members of the Order of the Phoenix were busy casting multiple strong shield charms, in order to stop Voldemort and his forces as long as possible.
Just when the shields were about to fuse and seal the school off completely, an extremely fast moving, flaming object crashed into the courtyard of the castle.
Cautiously, Harry, Ron, Hermione and Professor McGonagall went closer to the impact crater, their wands drawn and the tips were already glowing red. But what came then was definitely not what they were expecting.
"Oh dear, that was so hot, I was afraid my skin would melt off. Wait, I don't have skin anymore YOHOHOHOHOHOHOHO!!!!"
After this a skinny figure jumped out of the dust cloud that was covering the crater. When the figure landed, all wizards present were weirded out and extremely scared. Standing in the yard, stretching, was a skeleton. A moving, talking skeleton, dressed in a stylish, black suit, with a cane in its hand, a Violin strapped on its back and, strangely enough, a huge Afro on its head.
Noticing the numerous people around itself, the skeleton bowed and said "Where are my manners? I am known as 'The Soul King' Brook. It is my utmost pleasure to make your acquaintance." Its, or better said his, view roamed the crowd of wizards and witches, until it came to a stop upon teaching Fleur Delacour.
Brook walked towards the blonde woman and asked calmly and (to the astonishment of everyone present) completely serious "Excuse me please Mademoiselle, but could you please show me your panties?"
This question managed to overwrite Fleur's fear she felt for the skeleton. Fear made room for rage and Fleur kicked Brook in the head. Strong. "FORGET IT!!!!"
To her shock, Brook didn't even seem fazed by her kick, he just laughed "YOHOHOHOHOHOHOHO, you are really brutal!!!!"
It was then that Brook noticed the shield in the Sky. He asked "What is going on here? Are you under attack?"
It took a few minutes of Harry, Hermione and Lupin explaining everything in the shortened version to the skeleton. When they finished, Brook said "Then let me allow to assist you as a thanks for being the first humans I've seen in a long time"
He grabbed his Violin and began tuning it while he hummed softly. Ron then asked "How d'ya want to help us bonehead? You are just one skeleton and out there are hundreds of DARK wizards and worse!"
"YOHOHOHOHOHOHOHO, you are mistaken Ron-san. I am not alone. I will never be alone."
He began playing a soft, upbeat tune on his Violin and continued "Allow me to finish this fight for you my friends, then I will tell you my story"
Green light started to flow out of his body, and an avatar of Brook materialized behind the skeleton and laughed loudly. The avatar spread its arms wide and Brook then yelled "RUMBA ORCHESTRA-LAST ENCORE: MARCH OF THE STRAWHATS!"
Behind the avatar, dozens of people with all kinds of weapons appeared. In front of the avatar stood ten people.
A dirty-blonde haired man with tattoos under his eyes and a saber in his hand.
A huge blue creature that stood in some kind of martial arts stance.
A hulking man with blue hair and giant forearms.
A beautiful, black haired woman, whose figure was even making Fleur feel insecure, had her arms crossed over her chest.
Something that looked like a deer but also human.
A blonde man with a cigarette in his mouth.
A long nosed man with a slingshot.
Another beautiful woman with orange hair and a weird looking staff in her hands.
A man with green hair who was holding three swords, one of them in his mouth.
And finally, a black haired young man with a straw hat on his head.
"Shishishishi, yo Brook, need our help?" asked the straw hat wearer.
"Indeed Luffy-san. While it is wonderful to see you all again, sadly our time is limited. Can I count on your assistance? And on yours as Well, Yoki-san?"
The dirty-blonde man replied "Nahahahahaha!! Do you even need to ask Brook? We are the Rumba Pirates, we can even make crying children laugh again! ARE YOU READY BOYS?" The large mass of people cheered loudly in agreement.
"Same goes for us, Brook. Let's do this guys!" The other eight people nodded in agreement.
What followed could only be described as a one sided slaughter. The people Brook summoned were too fast to get hit by Magic, and they were using powers that should be impossible to be used, and that was coming from a bunch of witches and wizards.
Thanks to them, there weren't any casualties on the side of the Hogwarts defenders. Voldemort himself was first kicked from the edge of the forbidden forest all the way to the great hall by a flaming foot, then he was sliced by three black blades, the force of the sword strikes sent him to Hogsmeade, where he was then crushed by a gigantic fist.
Bellatrix was fried by a bolt strike from a cloud with a face. Greyback and his werewolves either had their spines snapped by hands that grew on their backs or they were turned into a red mist by heavy artillery fire.
Crabbe and Goyle Senior had their heads blown off their shoulders by a fast, blue fist. A bunch of high ranking Death Eaters were attacked by giant, man-eating plants or they simply got impaled by huge antlers.
Most of the snatchers got destroyed by the Rumba Pirates.
Lucius Malfoy was trying to flee with his son, His wife was left behind since he didn't need her anymore. But when the two reached the outer edges of the Hogwarts wards, they were facing Brook. The skeleton had his sword drawn and was walking towards the two.
The two wizards decided to ignore the humming skeleton and passed him, but the ice cold voice of Brook let them stop.
"I can't allow scum like you to escape." He then stopped walking and sheathed his sword. "And to your dismay, I have already walked 10 steps. Hanauta Sancho~~" The two Malfoys continued running "YAHAZU GIRI!!!!" Brook slammed his sword fully into the sheath and in just that moment, deep cuts appeared on the necks of the two Malfoys, killing them instantly.
Several weeks later, Death Chamber in the Department of Mysteries
After the battle, the people Brook summoned vanished into thin air. Brook then had to spend a few hours telling his story to the mass of witches and wizards. He explained how he once died and came Back, thanks to his Devil fruit, and how he was able to summon the souls of his friends from the afterlife for a short amount of time.
He told the tale how he was saved by the Strawhats, how they fought against mighty pirates and corrupt governments. And finally, He told them how he and his friends achieved their dreams, how his friends died and how he was unable to follow them into the afterlife.
Then, to lighten up the now somber mood, he requested a Piano, and then he taught the wizards and witches the song that helped him through hard times and brought him joy in any situation. For hours then, the pirate song "Binks Bree" was heard all over the Hogwarts grounds.
A few days later, Hermione told Brook about the veil of death, some kind of one way path to the afterlife. Brook was then quick to write down his memories, he gave them to Hermione and told her to do with them whatever she wanted. Then he made his way to the veil.
Harry, Hermione and Ron accompanied him. Brook now stood in front of the veil, tears were starting to well in his eyes. "Harry-san, Hermione-san, Ron-san. I thank you for bringing me here. I-i am so happy to be alive right now, I could cry my eyes out. Even though I don't have eyes anymore. YOHOHOHOHOHOHOHO!!!!"
Hermione and Ron groaned because of the horrible Skull Joke, but Harry laughed loudly, he had developed a fondness for them in the last few weeks. Hermione then asked "Why are you happy to be alive when you plan to go through the veil?"
Brook looked at the golden trio with tears still streaming down his cheeks. "Because I am alive, I can finally meet my Nakama again. Sayonara my new friends, farewell" and with that, he stepped through the veil, where he was immediately pulled into a long, big and strong tenway hug.
Just had this Idea while eating dinner and I wouldn't leave me alone, so I had to write it down :D
Hope you liked it
See you next time, Bye :D