The discovery of Kenpachi Zaraki, though not yet Kenpachi, provided Soul Society with plenty of talking points for a long time because this kid was too powerful Zaraki.
How powerful was he? Let's analyze why he killed so many people.
The whole thing started with the death of the Third Division member. He died, leaving behind his Zanpakuto. As mentioned before, new members who want to go on patrol missions need to guard the gate and clean for three years; by then, they would have already acquired their Zanpakuto.
After this person died, his Zanpakuto was stolen. The person who stole it was later discovered to be a former bully from 57th Street. After being relocated to 79th Street, he gathered a group of thugs who committed countless atrocities, including rape, kidnapping, and other heinous crimes.
Then, having obtained Zanpakuto, he became even more arrogant. He had already almost unified 79th Street, so he wanted to attack other districts and become the first King of Rukongai.
Then this whole bunch of damned stuff marched towards 80th Street, which was right next door, so close! And the guy's plan was to take the back first, unify the back, and then those obedient streets in the front would be easy to take over.
Both their strategy and plan were sound, and then, just as they were fighting the gang from 80th Street, a teenager appeared.
The boy strangled one of the enemies on the outskirts of the battle, seized an ordinary machete, and then used it to fight his way from the outer edge to the outer edge, cutting through the entire battle zone.
What the hell is this?! The two gangs that were fighting were completely dumbfounded, and then enraged! So they all ganged up on this kid.
So the boy, wielding a machete, went on a rampage, slaughtering his way through the corpses. Just then, the guy who had obtained the Zanpakuto got angry. "You think you're so tough? Aren't you ruining my reputation? I can even kill Soul Reaper, why would I be afraid of a little brat like you?"
So he swung his Zanpakuto in half. However, the boy caught the broken blade in mid-air with his free hand, severing the thug's wrist in one swift motion, and then snatched the Zanpakuto.
The instant the boy's hand touched the Zanpakuto, a surge of Reiatsu was unleashed, and the Zanpakuto reverted to its tattered form. Simultaneously, the head of the bull-man who had killed the Soul Reaper fell to the ground.
Normally, this should have been the end, but for some reason, the people on the battlefield seemed to be hypnotized, rushing towards the boy like madmen, all wanting to kill him. The boy wielded his long sword, which was longer than everyone else's, yet he used it without any hesitation.
Then a mountain of corpses appeared. The somewhat exhausted boy stuck his sword in the ground and sat down on the mountain to rest. The corpses had already begun to transform into Reishi. At this moment, Retsu Unohana arrived.
Isn't that amazing?! That fighting power alone, plus the sinister aura of that sword, makes it a real topic of conversation. And after learning about this, the Captain-Commander announced that he wouldn't take the sword back, because it had already Shikai. According to Soul Society, Shikai sword can't be given to someone else; taking it back would be useless.
Look, look!! Shikai!! What the hell is going on? How many members of the Gotei 13 don't have Shikai yet!? This guy just got his sword and he's Shikai, can you believe it?
Angry! Aren't you angry!?
What's the use of getting angry? She's a formidable person who could stab Captain Unohana. Although Unohana is compassionate, her Reiatsu is real. To stab a captain, her combat power is no joke. This is what people who don't know Unohana's past think. Those who know Unohana's past would be even more shocked!
Let's put it this way: unless you're ranked in the teens or twenties, and specifically Seated Officer in a combat team, you'd probably just be feeding the enemy's kills if you went there.
Incidentally, the first King of Rukongai in Soul Society has been chosen—it's Zaraki. For the next few hundred years, anyone with even a modicum of knowledge who saw this sword would instantly be met with the utter annihilation of all evil.
More than thirty years have passed, and Jun is once again on a teaching mission with Isuzu. On their very first day at the academy, they are both dragged to Secret Base by Kōga, in the corner behind the Journal Hall.
"What's wrong?" Jun asked with a smile, but she seemed to have some thoughts in mind. Isuzu was genuinely curious; she didn't know why.
"What's wrong!?" Kōga, a # symbol popping out above his head. "What the hell did you put in the Journal Hall!?"
"Oh, you've already found it?"
"What?" Isuzu looked completely bewildered, her hand automatically placing on Jun's waist. "Anata~, what have you been up to behind my back this time!?"
"Cough cough, let go, the child is here."
"It's okay, you two continue, I didn't see anything."
Over the years, the Chun couple each came every other year to teach him for three months. Their relationship was as close as that of a father and son, or a mother and son. Kōga had long since become quite mischievous.
Isuzu released her grip, and Jun's expression turned serious. "You call yourself my disciple? This composure is truly astounding. Sigh, I think it would be better to raise the selection criteria a bit?"
"Huh!? My willpower isn't strong enough!" Kōga was terrified by Chun's shamelessness. "Don't you know how scary what you put out is!?"
Now Isuzu took it seriously, "What exactly did you put there!?"
"How can we go see it now? It's all packed with people at the Journal Hall. Let's wait until tonight. Come on, I have a public lecture to give anyway."
"You!"
"What do you mean, 'you'? Huh? You dare to swear at me? You little brat, aren't you being a bit too naughty?"
Kōga then realized what she had just done, her face flushed red, and she quickly apologized to Chun.
"Calm down! Did you tell anyone about it?"
Of course not!
"Then why are you so angry? Getting anxious won't solve anything."
Kōga looked at Chun, and after calming down a bit, he realized that Chun had been incredibly calm from the very beginning, showing absolutely no signs of impatience.
"Why are you so calm?"
"Because of my abilities, I believe I can handle even if some problems arise there."
How do we handle this?
What do you think?
Kōga swallowed hard; all he could imagine was gore, yet Chun remained calm.
Just as you think, as long as you have the ability to control everything, you can be confident enough.
Chun's open class was as successful as ever, drawing a huge crowd from the entire academy. Chun's lecture was as excellent as ever, sharing many tips on spiritual practice and learning, ways to relax, and advocating for a balance between work and rest.
As the day passed, and night fell, when almost everyone in the college had fallen asleep, with only a few night owls still awake and engrossed in their studies, three people stealthily appeared in the Journal Hall.
Jun lit the lamp, Isuzu jumped up and down, "Jun! What are you doing!?"
"I have already released Kaei True, so to others it's still dark here."
"What is that? When did Kaei acquire true form?"
"Self-created Kidō!"
Wow! I want to learn too!
"Okay, I'll teach you tomorrow."
"Can you two stop showing off your love?" Kōga was annoyed; he had to be subjected to this constant display of affection, it was unbearable.
"Hehe, okay, Kōga ~ Where's the secret you mentioned?"
"Hey? Master's wife, can't you see?"
Kōga looked at Isuzu, then at Jun, who nodded.
"Only you can see it, I can't, because I'm no longer within the selection rules. Although I know where the item is, I can still brute-force it."
Is that so?
Kōga was truly shocked. Then he walked to the east wall, faced it, and suddenly entered the wall.
"Huh!? Kōga walked inside the wall!"
Then, after a while, Kōga came out again.
"What's inside the wall? How did you do that, Chun? Space Kidō!?"
Chun gave his lover a clumsy chop, saying, "What are you thinking? How could you not see the immense influence of the Space Kidō? Actually, you should go look at the outer wall and then observe the inner wall."
The two ran outside and looked left and right, finally measuring the distance. They discovered that the inner and outer walls on the east and west sides were half a meter thick. However, because of the symmetry and the fact that the internal bookshelves completely blocked the corners, unless one had a particularly strong sense of space, they wouldn't notice anything amiss. Besides, the Journal Hall was quite large, so it wouldn't feel cramped and they wouldn't have considered the thickness of the outer walls.
"What exactly did you put in there!?"
Is there something on the other side too!?
They each had something they cared about.
"There's something on the other side. Since you can't see it, it means you're not qualified."
"What I put in there was just what we learned, and some secrets."
As she spoke, Chun took out a stack of Journal, then walked to the west wall. Chun placed her hand on the wall, and Spiritual Power surged from her hand. With a burst of Spiritual Power resonance, the wall disappeared.
Isuzu and Kōga stared in shock at the small stack of Journal hidden inside the West Wall. Jun arrived, placed his newly brought stack of Journal on top, and the wall sealed shut the moment Jun emerged.
"What are all those things?" Isuzu cried out, tears welling in her eyes, determined to give Jun an explanation.
Chun held his beloved in his arms and whispered, "It's Starrk's contact information, the Undead's settlement, what happened back then and what we did, the Arrancar's development path, and the Undead's development path."
"Are you crazy!?" Isuzu stared at Jun in shock.
I'm not crazy.
Chun released his wife and placed his hand on Kōga's head, who looked completely bewildered.
"This is the disciple I've chosen. If he's capable enough, he'll see all of this, and he'll understand the necessity of keeping it all hidden. If one day we're exposed, if we become enemies of Soul Society, if we die, then everything I have will still be inherited!"
"This is the last thing my mentor, Hanazawa E, taught me: no matter what, there must be a legacy to pass on! Ideas and paths are more important than life itself!"
Hearing these words, Kōga was inexplicably moved. He trembled all over, feeling a kind of pressure. For the first time, he, who had never feared anything, felt afraid. He sensed that the man in front of him, this always gentle and calm man, possessed a weight he had never imagined.
"I... can I do it?" Kōga was completely dumbfounded; he didn't even know how he managed to say those words.
Jun smoothed the boy's hair and smiled gently, "If your abilities are insufficient, you won't be able to see what's inside the West Wall. Use what's inside the East Wall, and you'll live well in Soul Society. You'll be happy and won't need to bear any more burdens."
Kōga Chun's words clearly, Xianghe's gaze instantly hardened, and he slapped Chun's hand away. "I can! I can definitely get into the West Wall! Don't underestimate me!"
"Haha~ Great, then you'll have to work really, really hard. Your current state might not be enough to get into the West Wall before graduation."
Kōga instantly bristled, "I can do it!! I'll risk my life to get in!!"
"Then go back to sleep. If you're not in good spirits, you'll waste tomorrow."
"I understand, goodnight Master and Mistress!" The little guy bowed and immediately disappeared.
Jun smiled, Isuzu, seeing Jun's expression, sighed.
"You always have your reasons; you have big things on your mind, and I, this little woman, am afraid I can't keep up with you."
Jun looked at Isuzu earnestly and sighed, "I know you can't keep up. Soul Society is dangerous. You've been watching with me for so long, you should know that."
"Yes, what should we do then?"
"Fool, I'm walking so fast, so fast you can't keep up, all so that you won't have to worry about any dangers in the future. Our children, our grandchildren, will never be afraid of these things again."
Tears streamed down her face Isuzu threw herself into Jun's arms, sobbing, "How could you be so foolish!? Did you think you could take on the entire Soul Society by yourself!?"
"How will we know if we don't try?" Chun's gaze was incredibly profound. "Besides, I'm not alone. We will cleanse the entire Soul Society!"