So, if you read my last story you will know that Urahara fought a Vasto Lorde (which was supposed to be Grand Fisher) and ran out of reiatsu and then the Vasto Lorde launched a cero at the Kurosaki's and then died.
So without further ado, let's answer some of the questions you guys might have
"Who is the Vasto Lorde"
Me: Just an average Vasto Lorde
"How come Urahara was defeated so easily?"
Me: He had like 90 something years without training and got rusty
"How did the Vasto Lorde look like?"
Me: He looked like Nnorita and was arrogant as ****
"Why did Urahara come instead of Yoruichi?"
Me: Urahara is one of my favorite characters and I just think he is stronger than Yoruichi, so I'm debating whether to change it to make the story more realistic or leave Yoruichi with Kukaku in Soul Society, If I change it you guys might say, "Hey, where is she to rescue him?" and I'll be like "****", Because if I did add Urahara, their combined powers would've beaten the Vasto Lorde
"Was that your first story"
Me: Yes
"Why did you separate that from this story?"
Me: I do that, because different chapters may have different ratings
"How strong is current Urahara?"
Me: Kommamura (post-invasion)
And that is all I could think of, if you want me to answer your questions about this story or the prologue, review in this story and maybe I'll answer it in another chapter
Oh yeah, any personal questions about me, you can find answers on my profile page, and I don't take up 1 chapter for AU's because I feel bad to get your hopes up, I make AU's at the bottom of every chapter
So, let us begin

************************
Disclaimer: All rights of Bleach go to Tite Kubo
"YO" - Author

So, let's assume that still 9 year old Ichigo had pulled his chain of fate off out of curiosity (because we all know that he really is that stupid), then became a hollow.
(I might go into depth about that later in a different story if you guys want me to)
Ichigo was playing with his finger and opened a garganta.
He went in it and immediately, his innocent mind became corrupted with the knowledge of Hueco Mundo
He rubbed his tummy and ran to a sleeping hollow, and devoured it.
He roared and a purple stream of reiatsu illuminated the dark sky
His appearance changed to a humanoid figure with a skull mask and 2 horns. He had red fur on his ankles and wrists and a hole on his chest with strange markings surrounding it.
He charged some of his reiatsu in his finger and fired a cero at an unknown hollow
Ichigo did this repeatedly an ate until he evolved into an Adhuchas
His appearance changed once more.
He now had wings and a tail.
He then searched for more food
Ichigo went into the forest of Hueco Mundo and met a panther like Adhuchas.
Ichigo put up a finger and charged a cero
The other hollow mimicked Ichigo, except putting up a hand
The ceros launched toward each other, but Ichigo's prevailed with slight difficulty "Hey" the other one said, "not bad."

Ichigo said, "Are you on your way to Vasto Lorde?"
Grimmjow grinned, "I like where this is going, so let's assume I am, what now?"
Ichigo wore a similar grin and said, "well today is your lucky day, because I'm almost there, wanna join my group?"
Grimmjow said, "Prove to me that your strong enough"
Ichigo smirked as if knowing he would say that.
Without asking, Ichigo placed his palm forcefully on Grimmjow's face and slammed him across the current of the air
He charged a cero as Grimmjow was recovering from the shock, sending Grimmjow flying.
Grimmjow slashed with his paws through the smoke, revealing a bloody panther
"You *******, ugh," He rubbed the blood of his face and started panting.
Grimmjow charged reiatsu on each individual finger and slashed down, saying "Desgarron"
Ichigo flew to the side and towards Grimmjow, lashing at him with his tail.
Ichigo brought his tail down, and pierced the armor covering Grimmjow's body
Ichigo slammed his feet on Grimmjow's falling body and blasted a cero at his head.
Grimmjow brought Desgarron back up, except this time surrounded him with it in a circle.
It blocked most of the damage, but not all.
"That's a good way to welcome the newest member" said Grimmjow.
Ichigo grinned and vanished in a blur of Sonido, slipping past Grimmjow's Pesquisa.
Grimmjow looked around in confusion then got a foot to the face as a response.
Grimmjow said reluctantly, "Ok, you win, I will accompany you." Ichigo grinned, "That's not a nice manner to speak to your new leader."
Grimmjow was infuriated, but kept his mouth shut.
They ventured further into the Menos Forest and found a insect-like hollow named Pesche and a Tiki faced hollow named Dondochakka.
Grimmjow rubbed his stomach and said, "Dinner" and was about to devour the cowering hollows, until a girlish voice said, "Stop."
Grimmjow dropped Pesche and Dondochakka and they hid behind a girl centaur-like hollow.
Grimmjow said, "This is my dinner."
The lady hollow said, "Pesche and Dondochakka are my friends, Little Adhuchas."
Grimmjow knew that he had messed with the wrong Vasto Lorde, but he fired a cero and disappeared in a blur of Sonido anyways.
The centaur-like hollow swallowed the cero as seen by Grimmjow when he was looking back and exhaled it adding her cero, and making it a huge pink cero, obliterating the whole forest and almost Grimmjow, but Ichigo arrived in time next to him and sonidoed out of the blast range.
As Grimmjow was telling the story of the lady hollow, Ichigo was on the floor laughing hysterically and said, "You idiot, if you knew that she was a Vasto Lorde, you shouldn't have fired a cero."
Grimmjow blushed red with embarrassment.
"Next time, I will try."
"Ok"
(So their life went on like that until Ichigo evolved and became more humanoid and stronger and Aizen visited him, Nel, and eventually, Grimmjow. They all got their respective zanpactous (Gamuza, Pantera, and Zangetsu (the real one spoilers from the 1000 year blood war))
Ichigo, Nel, and Grimmjow and other strange people were sitting in Las Notches and Aizen said that they would be getting their numbers today. A black cloud swept over all the Espada and when it left, Aizen asked them to introduce themselves.
"Yammy Llargo, 10th Espada" said a large man with a huge grin on his face.
"Aaronierro Arruruerie, 9th Espada" said to hollows in one container each looking like a brain.
"Szayelaporro Granz, 8th Espada" said a guy with weird pink face and glasses
"Zommari Rureaux, 7th Espada" said a guy with dark skin and a beard and two yellow eyes
"Grimmjow Jaeqerjaquez, 6th Espada" said a guy with blue hair and a half jaw of hollow teeth
"Nnorita Gilga, 5th Espada" said a guy with an eye cover over his left eye and girlish hair
"Ulquiorra Cifer, 4th Espada" said a guy with a horn over the left side of his face with green eyes.
"Neliel Tu Odelschwanck, 3rd Espada" said a girl that had a mask covering the top of her head
"Coyote Starrk, 2nd Espada" said a bored guy with a goatee and an eye patch
"Ichigo Kurosaki, 1st Espada" said a guy with long orange hair