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|Romaji Name||Mizuno Kaoru|
|Seiyu||Kouhei Kurihara (In Reborn! VOMIC)|
|Manga Debut||Chapter 284|
Kaoru Mizuno is a member of the Simon Famiglia. He previously attended Simon Middle School, but transferred to Namimori along with his Famiglia after an earthquake hit their area. They chose Namimori because it is relatively earthquake free and are invited to the Vongola Decimo's Inheritance Ceremony. He is the eldest of the 7 students who transferred to Namimori Middle School, grouped with Yamamoto to protect Tsuna by patrolling the sports facilities in Namimori Middle School.
Kaoru is one of the eldest members of the seven transfer students, and one of the few members that doesn't resemble a middle schooler. Because of this, he's often labeled as a "hooligan" due to his appearance. Kaoru's appearance is similar to the rest of the Simon; he is often seen wearing his school uniform and is very tall and fairly muscular with blonde hair. Kaoru also has red eyes, a trait shared amongst the other members of Simon.
Many people are afraid of him because of his appearance, which has been described to look like a "hooligan;" however, on the inside, he is actually a quiet and shy person. Yamamoto is the only one who is nice to him and the first person to call him friend, and this made him happy, as seen from his tears. However he seems to easily resort to violence if he feels threatened. Because of this according to Koyo he is known as "The Hospitalizing Devil Kaoru."
He first appears when he joins the baseball club, where he wants to play as pitcher. Later, he was seen practicing baseball together with Yamamoto (the rest of the teams ran off when they knew Kaoru was going to be coming). He commented that he was nervous when other people watched him play. But, he was able to play after Reborn and the others wore vegetable costumes made by Haru and cheered for him. When he threw the ball, the ball vanished as Yamamoto caught it. This made Reborn wonder what he was capable of and only furthered his theory that the Simon Famiglia wasn't as weak as they were rumored to be.
While he and Yamamoto rested in the locker room after practicing baseball, Kaoru's ring suddenly fell and Yamamoto picked it up. Just as Kaoru snatched his ring, a piece of paper fell and it had the Vongola Crest crossed with the Italian word "delitto," which can mean crime, murder, offense, or delict written across it. With Yamamoto suspicious, Kaoru ignited his ring with flames and impaled Yamamoto, leaving Yamamoto In a pool of blood, badly injured. Kaoru leaves the locker room shortly after. Yamamoto managed to write the word "delitto," or "sin," on the wall with his own blood. Reborn had some suspicion against Kaoru because he was with Yamamoto at that time, but he comes up with an alibi that he had left earlier and Yamamoto had been attacked while he was gone. The next day, Kaoru was later seen at the Vongola Inheritance Ceremony with the rest of Simon Famiglia, who were all surprised to see Yamamoto. He is later seen amongst the crowds during the ceremony waiting along with the rest of the Simon Famiglia, when Tsuna was to receive the Vongola Sin from the Ninth.
After an explosion, the sin was broken open, supposedly by Enma. The Ninth revealed that the Sin in the ceremony was merely a fake. He proclaimed that the real one was in a safe that was impossible to penetrate. Suddenly, the safe was broken open, revealing Kaoru and Enma with the rest of the Simon. Enma stated that they came to the ceremony to take back the "Sin" for the Simon Famiglia, and to get revenge on the "Vongola". Tsuna asked Enma why they attacked Yamamoto. Enma responded that he was a Vongola Guardian and it was a "rightful atonement." Enma then went on to explain that the Sin belonged to the Simon Famiglia and that it was the blood of their First Boss. Enma declared that he would take over their Famiglia as the Simon Famiglia and take revenge on the Vongola by gathering Mafia from all over the world and standing above them as their leader. The purpose of the war was to gain back the pride of the Simon. Kaoru and the others then released their rings as Enma said that the reason that Vongola Primo got rid of the Simon was because they had a power that rivalled the Seven Flames of the Sky, which were the Seven Flames of the Earth.
Enma then went on to defeat Tsuna and his Guardians. The Simon Famiglia then took their leave and take Chrome with them back to their home. After when Tsuna, and the others have recovered, they head of to Simon Base to get Chrome back, and to stop them. Enma and the other Simon members greet Tsuna and the other Guardians. The two families are about engage in battle, but Reborn asks why did they bring the those sinster bunch, the Vendice. This surprises the Simon, Adelheid asks why are the Vindice here, to which the Vindice reply that they were there to honor the agreement the Simon Primo and the Vongola Primo. The Vendice state that since the two boss treated each other as friends, the two made an agreement to never attack. The Vedice Guardians claim that the two Families would have to fight one another, and the loser would go to prison forever.
The Vindice then take their leave, but before going, Adelheid asks how would they know who wins the battle. The Vindice reply back that if the loser pride is broken, then the other Famiglia wins. The Simon Famiglia tells Tsuna and the others that since this was their home land, they wouldn't engage in battle yet. They would have to follow one road that leads to them. The Simon then leave.
Kaoru, along with his Famiglia and the Vongola, receive memories from the first and second key. Upon receiving memories from the second key, Julie tells him that he need not fight anymore since he fought his counterpart already, Yamamoto.
He along with the rest of the Simon receive memories from the third key.After Adelheid is defeated by Hibari, the Vendice reveal the 4th key which proves that Giotto attempted to save Cozart from death but was stopped by Daemon. When Hibari notices someone within the bushes, Julie comes out with Chrome and reveals himself as Daemon. After revealing his true plans to the Vongola Famiglia and Adelheid, Kaoru appears from behind Daemon and stabs him through the stomach, stating that he won't forgive him for what he has done.
But, it was just an illusion and Daemon stabs him from behind. He tries to attack him again when Tsuna and his Guardians were trapped by Chrome, but it does nothing and Daemon tries to finish him off, but Yamamoto arrives and blocks the attack.At the beginning of the battle, Daemon launced a surprise attack behind Yamamoto. The attack was blocked by Kaoru who said that he knew Yamamoto could dodge it with his own, but said he wanted to pay his debt. Yamamoto called Kaoru an "idiot" for doing that, but he said it was in his own will to help his Famiglia and friends.
It was at this time that the Vindice show up and said that he had lost. Kaoru had given up his pride to protect his Famiglia in order to save Yamamoto, an enemy of the Famiglia. After that Kaoru was taken by the Vindice and the Fifth "Key" was later revealed. The Fifth "Key" was later to be revealed as a set of documents. After they saw the truth of the Fifth Key, Kaoru was taken by the Vindice along with Adelheid. Before being taken away, Kaoru asks Yamamoto if it was okay to be his friend again, and Yamamoto accepts the offer.
At the end of Daemon and Tsuna's battle, he and the guardians of both Famiglias are released from the Vendicare Prison. He is later seen playing baseball with Yamamoto, accidentally hitting the ball at Enma and Tsuna.
When Adelheid stumbles upon Enma and Skull after them nearly getting killed by Team Mammon on the first day of the Representative Battle of the Rainbow, Adelheid thanks Skull for saving Enma and agrees on behalf of the other Simon Guardians to become part of his team in the Representative Battle. Thus, Kaoru joins Team Skull.
On the second day, no one challenges Team Skull until just before the battle ends, whence a group of Vindice that eventually become known as Team Bermuda appear and defeat all of Team Skull in an instant, stealing their Rainbow Wristwatches to enter the battle as well. Team Skull is mortally wounded, but still alive at this point.
Weapons and AbilitiesKaoru has been shown to be physically strong and fast, as demonstrated when he threw a baseball so swiftly it appeared to disappear. He was also able to attack Yamamoto before he could even react and easily cause life threatening damage with his Earth Flame. Karou has also demonstrated that he is resilient enough to react even after being stabbed and slashed multiple times by Daemon Spade.
- Simon Ring: Kaoru, like the rest of the Simon, possesses one of the seven Simon Rings when unsealed by the Vongola Sin. In correlation to his Kendo abilities, when activated, the Ring transforms into a powerful drill shaped blade around his arm, which can easily pierce flesh and bone with little force required, while the rest of his arm is covered in armor.
- In the Reborn! Fandom, his number is 31.
- Even though he's around Yamamoto's age, being second year when he transferred to Namimori Middle, Yamamoto mistook him as an alumni and even the father of another student due to his hooligan-like appearance when they first met.
- He has a Regent hairstyle like Kusakabe, but smaller.
- His pride are his role and duties for the Simon Famiglia.
- Because he was taken away by the Vindice without a fight with Yamamoto, he is the only Simon Ring Holder to not have his Flame revealed.
|Simon Bosses:||Cozarto Simon | Enma Kozato|
|Enma's Guardians:||Adelheid Suzuki | Julie Katou | Koyo Aoba | Kaoru Mizuno | P. Shitt | Rauji Ooyama|
|Other:||Mami Kozato | Makoto Kozato | Magi|
|Weapons:||Simon Rings | Dying Will Flames of the Earth | Vongola Sin|
|Other:||Flood of Blood | Simon Island|