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Lambo is a 5-year-old hitman, who often refers to himself in third person as Lambo-san affiliated with the Bovino ("Bovino" means "Cattle" in Italian) Famiglia. He is the Vongola Lightning Guardian and the youngest Guardian. He was born in Italy. His main choice of weapons are pink hand grenades, and his future dream is to rule the world. Lambo dresses in a cow suit complete with a tail, and has a huge afro with horns on the sides of his head, which gives him the appearance of a bison. He comes to Japan to kill Reborn so he can prove that he is worthy of becoming his own Family's Boss. However, he is a complete crybaby and is no match for Reborn.
For the most part of the Daily Life Arc, Lambo tries to kill Reborn several times without much success. At the same time, he befriends Tsuna's Mom and is soon a common staple around the Sawada household, much to Tsuna's annoyance.
While Tsuna and his Family were fighting Birds, Adult Lambo and Adult I-Pin saved Haru from Jiji which was part of the bloody twins that are working together with Birds .
During the Ring Conflict with the Varia , Lambo is chosen to be the holder of the Ring of Lightning. He participates in the Lightning Ring Battle. The night before the Lightning Ring Battle, Adult Lambo appeared and told Tsuna about the Parallel Worlds. Adult Lambo had no memories of the Ring Battles telling Tsuna that he could have been from a world where there wasn't a battle. He also asked Tsuna to make sure that his past self not use the ten-year bazooka because 15-year-old Lambo didn't want to fight yet. The next night the battle started. During his battle with Leviathan, he is shown to be able to use the Ten-Year Bazooka twice in a row, switching with his 25-year-old self. The 25-year-old self claimed that it have been a long time since he saw Tsuna and the gang as the 25-year-old self is living in a world where Vongola and his gang had been destroyed.
He was unaffected by Leviathan's most powerful attack and gains the upper hand in the battle. However, he ends up losing the fight due to the short time-limit of the Bazooka's effects. Just as he was about to be finished off, Tsuna saved him but ended up losing his ring along with Lambo's as a result. Lambo remains in critical condition afterward, but is forcibly made to participate in the Sky Ring Battle in which Leviathan tried to finish him off before being stopped by Gokudera.
Along with the other Guardians, Lambo was brought into the Future in the place of his Future self. Kusakabe later brought Lambo, along with I-Pin and Chrome, to the Melone Base. He later received a Vongola Box along with the other Guardians after the invasion of the Melone Base .
During the Arcobaleno Trials Lambo is unimportant for the beginning, However, when you complete a trial the Vongola rings glow. When Lambo saw this he was attracted asked Gokudera who informed him all about the trials. Since then Lambo was intent on finishing a trial. He then joined Tsuna during Fon's trial. At first they couldn't catch him but when they used a plan, I-pin sent Lambo flying into Fon who landed in Tsuna's lap ending the trial, which was to catch Fon .
Again in Verde's trial Lambo was angry when Verde Popped his ball and asked him to pay for it. He then went running after Verde. On the beach, where Verde was, Lambo was sent flying and landed on Verde's ship. after most of the trial Verde used an attack which paralyzed everyone, However Lambo was not affected by Verde's attack due to his shock absorbing horns and gets upset and thus starts throwing grenades , ruining Verde's plan. Lal questions how Lambo is able to move and Reborn states that he is the lightning guardian who is impervious to electric shocks. Lambo then throws a grenade at Verde stopping his attack. Collonello flies over and picks up Lambo. Tsuna then finishes Verde off with an X-Burner.
Gokudera was supposed to teach Lambo how to use his Weapon, but during training, Lambo, in a fit of rage, opened his Vongola Box Weapon by himself. The consequences of this weren't quite safe for Ryohei, who Gokudera was also supposed to train, and himself.
After returning to the past for the Inheritance Succession, Verde was supposed to be Lambo's tutor. However Verde was curious about Lambo's power to absorb shocks and analyzed him during his trial which took place at an amusement park. Lambo's objective was to reach Lampo (the first generation Lightning Guardian), who was hiding in the castle, and give him a paper stamped with three rides he had been on. Verde sent robots after Lambo in order to capture him. However, Lambo's extreme release of energy from Verde's previous experimets during the rides destroyed the machines. Despite not completing his original task Lampo noted that Lambo had fulfilled his role as the Lightning Guardian and gave him his inheritance.
Lambo later joined the others in order to save the girls from Demon Spade and was separated from the others along with Ryohei. Lambo was then defeated by a doppelganger of himself but was saved by Hibari's rampage.
After the Choice battle, Lambo was tied up in his sleep and hidden under the sofa , allowing Torikabuto to impersonate him for the purpose of getting closer to Yuni. But in the end , Yuni and Chrome found out about Torikabuto's plan using their senses and I-pin found Lambo under the sofa thus leading Torikabuto and Tsuna into a battle . Later the group split up in the forest where the last battle would take place as Uni predicted and Lambo, along with Ryohei, Basil, Tazaru and Nosaru encounter Kikyo. Ryohei then uses the memory of Tsuna's mother ( Which Reborn assigned him to do when they are in extreame danger ) to get Lambo to release his Lightning Vongola Box. After destroying Velociraptor di Nuvola (Kikyo's box weapon) , he falls asleep due to great loss of strength after opening his Vongola box and changing it to Cambia Formia . After Tsuna defeats Byakuran and everyone returns to the past, Future Lambo is shown along with the other Future Guardians waiting for Future Tsuna.
Before the Inheritance ceremony Lambo became good friends with Shimon Family member Rauji Ooyama. However after the Shimon betrayed the Vongola he joined the others in invading the Shimon's Holy Land. While Tsuna and Gokudera and Reborn were asleep, Lambo was lured down a hole by a rabbit, where he finds Rauji waiting. Lambo then tries to get Rauji to play with him, but Rauji claims that he is no longer Lambo's "slave". Rauji then says that once he has beaten Lambo he will kill the others. Lambo then declares that he will be the one to kill Reborn. Lambo then lights his Flame and upgrades his Vongola Gear Stone which Reborn says is because Lambo will do whatever it takes to make Rauji play with him.
The stone then becomes the "Lightning Helm Version X." Rauji then says the rules of their fight will be sumo-style, with the first one to fall off the ring is the loser. As they start, Lambo complains that the Helm is too tight on him, which Gokudera says is because his hair is full of "useless crap." Lambo then takes the helm off as Rauji strikes him, and he is seemingly killed. As Rauji begins to gloat and lament that if Lambo were not Vongola and a few years older they could have been good friends, the dust begins to settle as 15-year-old Lambo appears and claims that from now on they are the same age.
When Tsuna ask Lambo if he remembers the fight with Rauji, 15-year-old Lambo appears he says that he banged his head on the edge of the platform and that it knocked all of his memories of the past. After Rauji declares himself as the Mountain Guardian, Gokudera says to Lambo that he must put the helmet on and Lambo agrees. When Lambo put his helmet, he summons a new Gyuudon. Gokudera orders Lambo to goes into Cambio Forma, but Lambo doesn't not understand that. But Lambo goes into Cambio Forma and then Lampo's Shield appears in a new form, as a full suit of armor. After overcoming some initial difficulties with he armor's weight, Lambo changes the form of the horns and the battle between Lambo and Rauji begins. In the first attack, Lambo is knocked over, due to Rauji's Mountain flame allowing him to synchronize with the earth. Lambo is discouraged to fight again, and when he is told the loser goes to Vendicare Prison, he is less willing to fight. Eventually Reborn and Tsuna voice their regrets of taking Lambo out of fear for his safety. Lambo then states that they are wrong, that in his memories, he was happy that he went with Tsuna and the rest of the Guardians, and that he wanted to grow up to truly become part of them. He says that Tsuna must always take him, and that he must win to be able to face his five-year-old self, and remembers how to use the Vongola Gear. He then charges his Flame and draws iron sand from the battlefield towards himself and forms the Elettrico Ironhorn, prepared to continue his fight against Rauji. He then charges Rauji with his "Ferro Corno Elettrico Shock", not only shattering Rauji's Ring Weapon and the flame-enhanced wall behind him, but also shoving him from the ring, making Lambo the winner. After Rauji exclaims that the Shimon's bond is strong because they all lost their families to the Vongola, the Vindice then appear and reveal the second key left behind by Vongola Primo. Rauji then asks Lambo if he thinks Tsuna has the makings of a great boss, to which Lambo replies no. He then explains that he's never seen Tsuna as his boss, but as a great brother and Rauji ponders if that could be a boss. As he is pulled away by the Vindice he exclaims that he will not forgive the Vongola, but accepts Lambo and with a smile says that he had fun with him. After Rauji is taken away to Vendicare Prison, the 5-year-old Lambo returns eating corn.
Abilities and Weapons
Techniques
Gyuudon
Elettrico Cuoio: Due to being struck many times by lightning, electricity passes right through Lambo with little effect.
Thunder Set: Adult Lambo summons lightning and stores them into his horns to use the collected volts to attack.
Elettrico Cornata: After using Thunder Set, adult Lambo can then charge his opponent in an attack called Elettrico Cornata. It's weakness is it's short range but 25 year old Lambo can project the electricity much further.
Elettrico Reverse: A technique used by 25 year old Lambo where he releases stored electricity into the ground.
Corna Fulmine (Lightning Horns): Only with Lampo's Shield, the shield unleashes powerful Lightning Flames to defeat the enemies around the user. The flames released are so solid and thin that they are able to pierce through an enemy like shrapnel.
Wide Horn: While in Cambio Form (Vongola Gear Version), Lambo can make his horns larger than usual.
Corna Molla Elettro Shock: From the curled horns of the new Cambio Forma, extremely fierce electricity is generated which in turn becomes an electromagnet.
Ironhorn Electorico: 15 year old Lambo melts and solidifies the iron sand, creating powerful objects which he uses as projectiles.
Ferro Corno Electro Shock: Lambo creates two massive objects by using the Iron Sand, and then coats it with the Lightning Flame.
Horns: These horns can store and release electricity, acquired from lightning.
Ten-Year Bazooka: This switches the target with their own self from ten years later for five minutes. Every time Lambo loses his cool, he uses it on himself, switching with his 15-year-old self.
Cambio Forma: Lampo's Shield(Lampo is Italian for Flash): Gyuudon takes the form of armor and a Shield that covers Lambo's body. It also forms a helmet on Lambo with the Lightning Crest in the middle.
Thunder Helm Version X: Upgraded version of the Vongola Lightning Ring combined with Gyuudon's Box Ring.
Gyuudon (Version X): The Vongola Gear enhanced Gyuudon and is capable of merging directly with Lambo for his Cambio Forma.
Trivia
His Boss felt honored and cried tears of joy when Lambo was invited to join the Vongola Family.
In the Reborn! Fandom, he can be referred to as either L or Lam.
He is called "stupid cow" (ahoushi) by Gokudera and Reborn.
His catchphrase is "ga ma n" ("gotta stay calm", "endurance", "hold it in", or "tolerate", etc), which he says before he cries.
Lambo has a deep connection with Tsuna's mother. Reborn said making Lambo remember her activates his Lightning Ring.
In the Phillipine dubbed version of Reborn!, his name is changed from Lambo to Rambo.
Lambo can only light his Flame when he is angry, sad, or homesick.
Lambo's favorite foods are grapes, octopus balls, and gumdrops.
Even though he's just a 5 year-old, he has a large amount of hair, he is a hitman and had personal weapons such as Hand Grenades.
According to Futa, Lambo ranks as the world's most annoying Mafia member, and is first when it comes to people wanting to kill him and use him as a seat cushion.
Adult Lambo, Spanner, Romeo and Lampo have the same Seiyu.
15-year-old Lambo resembles Bianchi's ex-boyfriend, Romeo; Bianchi mixes the two up and often attacks 15-year-old Lambo.
Lambo can withstand enough electricity to power an entire town, while a normal person would already be burnt to a crisp.
Adult Lambo is usually seen with one eye shut for reasons unknown.
It is revealed that Lambo's pride is that he never refuse a single invitation to come out and party specially when there's ladies.
It is revealed that Lambo doesn't view Tsuna as his boss, rather more of an older brother.
He was the first one to open his Vongola Box among Tsuna's Guardians.
According to Chrome in volume 32 extra, Lambo prefers to sleep on the floor because the bed is too soft to stay still for him, just like Ken.
